src/de/steamwar/network/packets/PacketHandler.java

@@ -82,7 +82,11 @@ public abstract class PacketHandler {
             return;
         }
         if (method.getParameterCount() == 2) {
-            method.invoke(this, packet, metaInfos);
+            if (metaInfos == null || method.getParameterTypes()[1].isAssignableFrom(metaInfos.getClass())) {
+                method.invoke(this, packet, metaInfos);
+            } else {
+                throw new IllegalArgumentException("MetaInfos is not assignable to " + method.getParameterTypes()[1]);
+            }
         } else {
             method.invoke(this, packet);
         }