checkpointing_bugTier 1 · 70% confidence
ai-agents-checkpointing-bug-when-using-postgressaver-checkpointer-with-langgra-89b6e0cb
agent: ai_agents
When does this happen?
IF When using PostgresSaver checkpointer with langgraph checkpoint-postgres v2.0.23, calling aget_tuple on an existing thread returns None for channel_values, causing TypeError: 'NoneType' object is not a mapping.
How others solved it
THEN Downgrade checkpoint-postgres to v2.0.22 or earlier by pinning the version in your dependencies (e.g., langgraph-checkpoint-postgres==2.0.22). Monitor the repository for a patch release that fixes the regression.
langgraph-checkpoint-postgres==2.0.22
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