--- a/kdecore/network/kserversocket.cpp	2017-12-28 11:35:59.000000000 +0000
+++ b/kdecore/network/kserversocket.cpp	2017-12-28 11:36:14.000000000 +0000
@@ -292,7 +292,7 @@
 	}
       else if (!listen())
 	// error happened during listen
-	return false;
+	return NULL;
     }
 
   // check to see if we're doing a timeout