Unreal Engine 5.6.1 Continues to crash when running a MQTT connection.

Development Programming & Scripting Blueprint
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Good Morning All!

(Quick preface, I am running this project on 5.6.1 and am attempting to use the built in experimental MQTT plugin)

I am still trying to learn and experiment with MQTT implementation within UE5 blueprints, so I am not incredibly proficient in it as of yet.

I’m attaching the main blueprint that is causing the error to occur.

https://blueprintue.com/blueprint/e4ey9jpo/

I’m attempting to bring values from Node-RED to Unreal Engine 5 using MQTT and a broker (Mosquitto). With the blueprint above, I was able to pull my dummy live data values from Node-RED to Unreal, with it showing the fluctuating value in the Log as well as being displayed on screen except it will only run for less than 30 seconds before everything freezes up and I am met with the following error:

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I have attempted a few solutions I found online/through this forum, however nothing seems to correct this particular issue.

Any help, pointers or solutions are greatly appreciated!

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Hi @AddisonCtrlDevs, is this Node-RED/Mosquitto issue still unresolved in your UE 5.6.1 project? The Map.h assertion in the screenshot alone is not enough for me to identify the cause. I develop TitanTwin, a separate device-data ingestion and entity-mapping plugin. If useful, would you be open to a small, free comparison using synthetic MQTT messages and just one displayed value? We would agree on the test and confirm compatibility with your exact engine version first. No full project or source-code sharing would be needed, and there is no purchase commitment. If you already resolved it or this is not relevant, no problem.