Update ros2_foxglove_bridge/src/ros2_foxglove_bridge.cpp

Co-authored-by: Hans-Joachim Krauch <achim-k@users.noreply.github.com>

ros2_foxglove_bridge/src/ros2_foxglove_bridge.cpp

@@ -731,7 +731,7 @@ void FoxgloveBridge::clientMessage(const foxglove::ClientMessage& message, Conne
     // get the specific parser for this schemaName
     std::shared_ptr<RosMsgParser::Parser> parser;
     {
-      std::lock_guard<std::mutex> lock(_subscriptionsMutex);
+      std::lock_guard<std::mutex> lock(_clientAdvertisementsMutex);
       auto parserIt = _jsonParsers.find(message.advertisement.topic);
       if (parserIt != _jsonParsers.end()) {
         parser = parserIt->second;