AttributeError: 'NoneType' object has no attribute 'group'

i got this error for every query

2025-06-07 19:55:24,009 - ERROR - Above prompt resulted in error, probably the model's fault: 'NoneType' object has no attribute 'group'
Traceback (most recent call last):
File "C:\Users\Hamza\Desktop\VS code\augmentoolkit-master\augmentoolkit\generation_functions\generation_step_class.py", line 145, in generate
ret = self.output_processor(response)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\Hamza\Desktop\VS code\augmentoolkit-master\original\steps.py", line 611, in parse_validation_step
determination = decision_pattern.search(response).group(1).strip()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'group'

using mistral on ollama and tried lm studio but i got the same error