diff --git a/src/WebSocketWrapper.h b/src/WebSocketWrapper.h
index ac33acc..562e236 100644
--- a/src/WebSocketWrapper.h
+++ b/src/WebSocketWrapper.h
@@ -75,7 +75,14 @@ struct WebSocketWrapper {
         auto *ws = getWebSocket<SSL>(args);
         if (ws) {
             NativeString topic(isolate, args[0]);
+            if (topic.isInvalid(args)) {
+                return;
+            }
             NativeString message(isolate, args[1]);
+            if (message.isInvalid(args)) {
+                return;
+            }
+
             ws->publish(topic.getString(), message.getString(), BooleanValue(isolate, args[2]) ? uWS::OpCode::BINARY : uWS::OpCode::TEXT, BooleanValue(isolate, args[3]));
         }
     }