diff --git a/src/framework/luaengine/luainterface.cpp b/src/framework/luaengine/luainterface.cpp
index 6c8b0646..6b7725b7 100644
--- a/src/framework/luaengine/luainterface.cpp
+++ b/src/framework/luaengine/luainterface.cpp
@@ -1120,7 +1120,8 @@ void LuaInterface::pushObject(const LuaObjectPtr& obj)
     m_totalObjRefs++;
 
     obj->luaGetMetatable();
-    assert(!isNil());
+    if(isNil())
+        g_logger.fatal(stdext::format("metatable for class '%s' not found, did you bind the C++ class?", obj->getClassName()));
     setMetatable();
 }