AttributeError: '_thread._local' object has no attribute 'value'

[programandoconro]

Exception in thread prediction_worker:
Traceback (most recent call last):
File "/usr/lib64/python3.7/threading.py", line 926, in _bootstrap_inner
self.run()
File "/usr/lib64/python3.7/threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "src/chess_zero/agent/api_chess.py", line 67, in _predict_batch_worker
policy_ary, value_ary = self.agent_model.model.predict_on_batch(data)
File "/usr/local/lib64/python3.7/site-packages/keras/engine/training.py", line 1575, in predict_on_batch
if self._uses_dynamic_learning_phase():
File "/usr/local/lib64/python3.7/site-packages/keras/engine/training.py", line 382, in _uses_dynamic_learning_phase
not isinstance(K.learning_phase(), int))
File "/usr/local/lib64/python3.7/site-packages/keras/backend/tensorflow_backend.py", line 73, in symbolic_fn_wrapper
if _SYMBOLIC_SCOPE.value:
AttributeError: '_thread._local' object has no attribute 'value'