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Cannot invoke "String.length()" because "str" is null

We are creating a Workflow agent to create transfer orders. The orders are created successfully.

But we call an existing agent to analyse the input and provide proper response, we are getting the error at the node which calls the reusable agent.

Cannot invoke "String.length()" because "str" is null

This has started appearing only today. The agent was working till last day.

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