Basic LLM Chain Node throwing "Cannot read properties of undefined (reading 'message')" suddenly

Questions
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aKKJe9arch2sthTf
I built a Resume Screener, The Basic LLM Chain Node is throwing a “Cannot read properties of undefined (reading ‘message’)” when i am using a Vertex Chat Model, but executing properly when i use a Gemini Chat Model.

I tried everything, but nothing is helping. The Basic LLM Chain Node is the latest once, I am using N8N Cloud. so i believe the N8N version is also latest

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So you might think its a problem with the Vertex Chat Model?? BUT NOOOO!
My other LLM Chain Nodes that are wired with Vertex Chat Model are working.

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Now i just want to punch something :))))