The status of user stories of the ready user story points metric can't be changed

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Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/bottle.py", line 868, in _handle
     return route.call(**args)
File "/usr/local/lib/python3.8/site-packages/bottle.py", line 1748, in wrapper
     rv = callback(*a, **ka)
File "/home/server/routes/plugins/injection_plugin.py", line 39, in wrapper
     return callback(*args, **kwargs)
File "/home/server/routes/plugins/authentication_plugin.py", line 31, in wrapper
     return callback(*args, **kwargs)
File "/home/server/routes/measurement.py", line 52, in set_entity_attribute
     entity_description = "/".join([entity[key] for key in entity.keys() if key not in ("key", "url")]
TypeError: sequence item 1: expected str instance, float found