Exception : org.python.core.PyException: TypeError: unhashable type: 'dict'

Sometime in perspective I have the following error:

org.python.core.PyException: TypeError: unhashable type: 'dict'

but I can’t figure out where it come from. Context in the logger is quite obscure…

Some project script is trying to use (assign) a dictionary as the key in another dictionary. Presumably at the top level, as this appears to be a traceback during script module reload.

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