diff --git a/neo.UnitTests/SmartContract/UT_InteropService.cs b/neo.UnitTests/SmartContract/UT_InteropService.cs
index 39687fd720..6a33a32abc 100644
--- a/neo.UnitTests/SmartContract/UT_InteropService.cs
+++ b/neo.UnitTests/SmartContract/UT_InteropService.cs
@@ -85,7 +85,7 @@ public void Runtime_GetNotifications_Test()
 
                 // Receive all notifications
 
-                script.EmitPush(UInt160.Zero.ToArray());
+                script.EmitPush(new byte[0]);
                 script.EmitSysCall(InteropService.System_Runtime_GetNotifications);
 
                 // Execute
diff --git a/neo/SmartContract/InteropService.cs b/neo/SmartContract/InteropService.cs
index 6868da1886..7aa7fd7284 100644
--- a/neo/SmartContract/InteropService.cs
+++ b/neo/SmartContract/InteropService.cs
@@ -236,13 +236,15 @@ private static bool Runtime_Serialize(ApplicationEngine engine)
 
         private static bool Runtime_GetNotifications(ApplicationEngine engine)
         {
-            var data = engine.CurrentContext.EvaluationStack.Pop().GetByteArray();
-            if (data.Length != UInt160.Length) return false;
+            byte[] data = engine.CurrentContext.EvaluationStack.Pop().GetByteArray();
+            if ((data.Length != 0) && (data.Length != UInt160.Length)) return false;
 
-            var hash = new UInt160(data);
             IEnumerable<NotifyEventArgs> notifications = engine.Notifications;
-            if (!hash.Equals(UInt160.Zero))
+            if (data.Length == UInt160.Length) // must filter by scriptHash
+            {
+                var hash = new UInt160(data);
                 notifications = notifications.Where(p => p.ScriptHash == hash);
+            }
 
             if (!engine.CheckArraySize(notifications.Count())) return false;
             engine.CurrentContext.EvaluationStack.Push(notifications.Select(u => new VM.Types.Array(new StackItem[] { u.ScriptHash.ToArray(), u.State })).ToArray());