diff --git a/README.md b/README.md
index 9c5f4310..3fec7e70 100644
--- a/README.md
+++ b/README.md
@@ -584,12 +584,14 @@ The implementation and usage of the mentioned `DateTime` to `int` converter is d
 class DateTimeConverter extends TypeConverter<DateTime, int> {
   @override
   DateTime decode(int databaseValue) {
-    return DateTime.fromMillisecondsSinceEpoch(databaseValue);
+    return databaseValue == null
+        ? null
+        : DateTime.fromMillisecondsSinceEpoch(databaseValue);
   }
 
   @override
   int encode(DateTime value) {
-    return value.millisecondsSinceEpoch;
+    return value == null ? null : value.millisecondsSinceEpoch;
   }
 }
 ```
diff --git a/floor/README.md b/floor/README.md
index 9c5f4310..3fec7e70 100644
--- a/floor/README.md
+++ b/floor/README.md
@@ -584,12 +584,14 @@ The implementation and usage of the mentioned `DateTime` to `int` converter is d
 class DateTimeConverter extends TypeConverter<DateTime, int> {
   @override
   DateTime decode(int databaseValue) {
-    return DateTime.fromMillisecondsSinceEpoch(databaseValue);
+    return databaseValue == null
+        ? null
+        : DateTime.fromMillisecondsSinceEpoch(databaseValue);
   }
 
   @override
   int encode(DateTime value) {
-    return value.millisecondsSinceEpoch;
+    return value == null ? null : value.millisecondsSinceEpoch;
   }
 }
 ```