diff --git a/pom.xml b/pom.xml
index 8ec16b1..ca0f338 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>com.ankoki</groupId>
     <artifactId>SkJade</artifactId>
-    <version>1.4.0-beta</version>
+    <version>1.3.4</version>
 
     <properties>
         <maven.compiler.source>1.8</maven.compiler.source>
diff --git a/src/main/java/com/ankoki/skjade/elements/expressions/ExprNearestStructure.java b/src/main/java/com/ankoki/skjade/elements/expressions/ExprNearestStructure.java
index 97b3e99..cd7397b 100644
--- a/src/main/java/com/ankoki/skjade/elements/expressions/ExprNearestStructure.java
+++ b/src/main/java/com/ankoki/skjade/elements/expressions/ExprNearestStructure.java
@@ -32,7 +32,7 @@ public class ExprNearestStructure extends SimpleExpression<Location> {
     static {
         if (Utils.getServerMajorVersion() > 12) {
             Skript.registerExpression(ExprNearestStructure.class, Location.class, ExpressionType.SIMPLE,
-                    "[the] (nearest|closest) (1¦(not |un)(explored|discovered)|) [structure [of]] %structuretype% (in|within) [a] radius [of] %number% (around|at|from|of) %location%");
+                    "[the] (nearest|closest) (1¦(not |un)(explored|discovered)|) [structure [of]] %skjstructuretype% (in|within) [a] radius [of] %number% (around|at|from|of) %location%");
         }
     }
 
diff --git a/src/main/java/com/ankoki/skjade/hooks/holograms/HoloClassInfo.java b/src/main/java/com/ankoki/skjade/hooks/holograms/HoloClassInfo.java
index 55db65b..0589da1 100644
--- a/src/main/java/com/ankoki/skjade/hooks/holograms/HoloClassInfo.java
+++ b/src/main/java/com/ankoki/skjade/hooks/holograms/HoloClassInfo.java
@@ -24,150 +24,151 @@
 public class HoloClassInfo {
 
     static {
-        Classes.registerClass(new ClassInfo<>(Hologram.class, "hologram")
-        .user("holo(gram)?s?")
-        .name("Hologram")
-        .description("A Hologram created with Holographic displays.")
-        .since("1.0.0")
-        .changer(new Changer<Hologram>() {
-            @Nullable
-            @Override
-            public Class<?>[] acceptChange(ChangeMode mode) {
-                if (mode == ChangeMode.DELETE || mode == ChangeMode.RESET || mode == ChangeMode.ADD) {
-                    return CollectionUtils.array(String.class, ItemStack.class);
-                }
-                return null;
-            }
+        try {
+            Classes.registerClass(new ClassInfo<>(Hologram.class, "hologram")
+                    .user("holo(gram)?s?")
+                    .name("Hologram")
+                    .description("A Hologram created with Holographic displays.")
+                    .since("1.0.0")
+                    .changer(new Changer<Hologram>() {
+                        @Nullable
+                        @Override
+                        public Class<?>[] acceptChange(ChangeMode mode) {
+                            if (mode == ChangeMode.DELETE || mode == ChangeMode.RESET || mode == ChangeMode.ADD) {
+                                return CollectionUtils.array(String.class, ItemStack.class);
+                            }
+                            return null;
+                        }
 
-            @Override
-            public void change(Hologram[] holograms, @Nullable Object[] delta, ChangeMode mode) {
-                if (mode == ChangeMode.DELETE) {
-                    HologramManager.deleteHologram(holograms);
-                }
-                else if (mode == ChangeMode.ADD) {
-                    if (delta == null || delta[0] == null) return;
-                    if (delta[0] instanceof String) {
-                        for (Hologram hologram : holograms) {
-                            HologramManager.addTextLine(hologram, (String) delta[0]);
+                        @Override
+                        public void change(Hologram[] holograms, @Nullable Object[] delta, ChangeMode mode) {
+                            if (mode == ChangeMode.DELETE) {
+                                HologramManager.deleteHologram(holograms);
+                            } else if (mode == ChangeMode.ADD) {
+                                if (delta == null || delta[0] == null) return;
+                                if (delta[0] instanceof String) {
+                                    for (Hologram hologram : holograms) {
+                                        HologramManager.addTextLine(hologram, (String) delta[0]);
+                                    }
+                                } else if (delta[0] instanceof ItemStack) {
+                                    for (Hologram hologram : holograms) {
+                                        HologramManager.addItemLine(hologram, (ItemStack) delta[0]);
+                                    }
+                                }
+                            } else {
+                                for (Hologram hologram : holograms) {
+                                    if (!hologram.isDeleted()) {
+                                        hologram.clearLines();
+                                    }
+                                }
+                            }
                         }
-                    } else if (delta[0] instanceof ItemStack) {
-                        for (Hologram hologram : holograms) {
-                            HologramManager.addItemLine(hologram, (ItemStack) delta[0]);
+                    })
+                    .parser(new Parser<Hologram>() {
+                        @Override
+                        public boolean canParse(ParseContext context) {
+                            return false;
                         }
-                    }
-                }
-                else {
-                    for (Hologram hologram : holograms) {
-                        if (!hologram.isDeleted()) {
-                            hologram.clearLines();
+
+                        @Override
+                        public String toString(Hologram hologram, int i) {
+                            return "hologram";
+                        }
+
+                        @Override
+                        public String toVariableNameString(Hologram hologram) {
+                            return "hologram:" + hologram.getCreationTimestamp();
+                        }
+
+                        @Override
+                        public String getVariableNamePattern() {
+                            return "hologram:\\d+";
+                        }
+                    })
+                    .serializer(new Serializer<Hologram>() {
+                        @Override
+                        public Fields serialize(Hologram hologram) throws NotSerializableException {
+                            Fields fields = new Fields();
+                            fields.putObject("id", HologramManager.getIDFromHolo(hologram));
+                            fields.putObject("location", HologramManager.getHoloLocation(hologram));
+                            fields.putObject("lines", HologramManager.getLines(hologram));
+
+                            return fields;
+                        }
+
+                        @Override
+                        public void deserialize(Hologram hologram, Fields fields) throws StreamCorruptedException, NotSerializableException {
+                            if (!hologram.isDeleted()) hologram.delete();
+                            HologramManager.createHologram((String) fields.getObject("id"),
+                                    (Location) fields.getObject("location"), true, true);
+                        }
+
+                        @Override
+                        public boolean mustSyncDeserialization() {
+                            return true;
+                        }
+
+                        @Override
+                        protected boolean canBeInstantiated() {
+                            return false;
+                        }
+                    }));
+
+            Converters.registerConverter(Hologram.class, Location.class, Hologram::getLocation);
+
+            Classes.registerClass(new ClassInfo<>(HologramLine.class, "hologramline")
+                    .user("holo(gram)?( |-)?lines?")
+                    .name("Hologram Line")
+                    .description("A line of a Hologram.")
+                    .since("1.0.0")
+                    .changer(new Changer<HologramLine>() {
+                        @Nullable
+                        @Override
+                        public Class<?>[] acceptChange(ChangeMode mode) {
+                            if (mode == ChangeMode.DELETE || mode == ChangeMode.RESET) {
+                                return CollectionUtils.array();
+                            }
+                            return null;
                         }
-                    }
-                }
-            }
-        })
-        .parser(new Parser<Hologram>() {
-            @Override
-            public boolean canParse(ParseContext context) {
-                return false;
-            }
-            @Override
-            public String toString(Hologram hologram, int i) {
-                return "hologram";
-            }
-
-            @Override
-            public String toVariableNameString(Hologram hologram) {
-                return "hologram:" + hologram.getCreationTimestamp();
-            }
-
-            @Override
-            public String getVariableNamePattern() {
-                return "hologram:\\d+";
-            }
-        })
-        .serializer(new Serializer<Hologram>() {
-            @Override
-            public Fields serialize(Hologram hologram) throws NotSerializableException {
-                Fields fields = new Fields();
-                fields.putObject("id", HologramManager.getIDFromHolo(hologram));
-                fields.putObject("location", HologramManager.getHoloLocation(hologram));
-                fields.putObject("lines", HologramManager.getLines(hologram));
-
-                return fields;
-            }
-
-            @Override
-            public void deserialize(Hologram hologram, Fields fields) throws StreamCorruptedException, NotSerializableException {
-                if (!hologram.isDeleted()) hologram.delete();
-                HologramManager.createHologram((String) fields.getObject("id"),
-                        (Location) fields.getObject("location"), true, true);
-            }
-
-            @Override
-            public boolean mustSyncDeserialization() {
-                return true;
-            }
-
-            @Override
-            protected boolean canBeInstantiated() {
-                return false;
-            }
-        }));
-
-        Converters.registerConverter(Hologram.class, Location.class, Hologram::getLocation);
-
-        Classes.registerClass(new ClassInfo<>(HologramLine.class, "hologramline")
-        .user("holo(gram)?( |-)?lines?")
-        .name("Hologram Line")
-        .description("A line of a Hologram.")
-        .since("1.0.0")
-        .changer(new Changer<HologramLine>() {
-            @Nullable
-            @Override
-            public Class<?>[] acceptChange(ChangeMode mode) {
-                if (mode == ChangeMode.DELETE || mode == ChangeMode.RESET) {
-                    return CollectionUtils.array();
-                }
-                return null;
-            }
 
-            @Override
-            public void change(HologramLine[] hologramLines, @Nullable Object[] objects, ChangeMode mode) {
-                for (HologramLine line : hologramLines) {
-                    line.removeLine();
+                        @Override
+                        public void change(HologramLine[] hologramLines, @Nullable Object[] objects, ChangeMode mode) {
+                            for (HologramLine line : hologramLines) {
+                                line.removeLine();
+                            }
+                        }
+                    })
+                    .parser(new Parser<HologramLine>() {
+                        @Override
+                        public boolean canParse(ParseContext context) {
+                            return false;
+                        }
+
+                        @Override
+                        public String toString(HologramLine hologramLine, int i) {
+                            return hologramLine instanceof ItemLine ? "hologram item line" : "hologram text line";
+                        }
+
+                        @Override
+                        public String toVariableNameString(HologramLine hologramLine) {
+                            return hologramLine instanceof ItemLine ? "hologram item line" : "hologram text line";
+                        }
+
+                        @Override
+                        public String getVariableNamePattern() {
+                            return "\\S+";
+                        }
+                    }));
+
+            Converters.registerConverter(TextLine.class, String.class, TextLine::getText);
+            Converters.registerConverter(ItemLine.class, ItemType.class, line -> new ItemType(line.getItemStack()));
+            Converters.registerConverter(HologramLine.class, Number.class, line -> {
+                Hologram parent = line.getParent();
+                for (int i = 0; i < parent.size(); i++) {
+                    if (parent.getLine(i).equals(line)) return i++;
                 }
-            }
-        })
-        .parser(new Parser<HologramLine>() {
-            @Override
-            public boolean canParse(ParseContext context) {
-                return false;
-            }
-
-            @Override
-            public String toString(HologramLine hologramLine, int i) {
-                return hologramLine instanceof ItemLine ? "hologram item line" : "hologram text line";
-            }
-
-            @Override
-            public String toVariableNameString(HologramLine hologramLine) {
-                return hologramLine instanceof ItemLine ? "hologram item line" : "hologram text line";
-            }
-
-            @Override
-            public String getVariableNamePattern() {
-                return "\\S+";
-            }
-        }));
-
-        Converters.registerConverter(TextLine.class, String.class, TextLine::getText);
-        Converters.registerConverter(ItemLine.class, ItemType.class, line -> new ItemType(line.getItemStack()));
-        Converters.registerConverter(HologramLine.class, Number.class, line -> {
-            Hologram parent = line.getParent();
-            for (int i = 0; i < parent.size(); i++) {
-                if (parent.getLine(i).equals(line)) return i++;
-            }
-            return null;
-        });
+                return null;
+            });
+        } catch(IllegalArgumentException ignored) {}
     }
 }
diff --git a/src/main/java/com/ankoki/skjade/utils/NonLegacyClassInfo.java b/src/main/java/com/ankoki/skjade/utils/NonLegacyClassInfo.java
index 19814a7..9848be2 100644
--- a/src/main/java/com/ankoki/skjade/utils/NonLegacyClassInfo.java
+++ b/src/main/java/com/ankoki/skjade/utils/NonLegacyClassInfo.java
@@ -11,8 +11,8 @@ public class NonLegacyClassInfo {
 
     public NonLegacyClassInfo() {
         //StructureType ClassInfo
-        Classes.registerClass(new ClassInfo<>(StructureType.class, "structuretype")
-                .user("structuretype?s?")
+        Classes.registerClass(new ClassInfo<>(StructureType.class, "skjstructuretype")
+                .user("skjstructuretype?s?")
                 .name("Structure Type")
                 .description("A specified structure type.")
                 .since("1.3.0")