src/macosx/classes/sun/lwawt/macosx/CPlatformResponder.java

@@ -158,10 +158,13 @@
                 testChar = KeyEvent.CHAR_UNDEFINED;
             }
 
             if(isDeadChar){
                 testChar = (char) out[2];
+                if(testChar == 0){
+                    return;
+                }
             }
 
             jkeyCode = out[0];
             jkeyLocation = out[1];
             jeventType = isNpapiCallback ? NSEvent.npToJavaEventType(eventType) :