Added code to send quit message only if game is not in single player mode

main.cpp

@@ -396,11 +396,13 @@ int main(int argc, char** argv) {
 	}
 	
 	/* If the game has been quit, ask the peer to quit as well */
+	if (type.mode != M_SINGLE) {
 		to_send_data = Serial_create_data(0, 0, 0, 0, true);
 		type.netsock->sendAll((char *)Serial_serialize(to_send_data), sizeof(Serial_Data) + 1);
+		sock_quit();
+	}
 	
 	window.Close();
-	sock_quit();
 
 	return 0;
 }