When the training round exceeds 17 rounds, the program crashes and stops

[wu12364564611]

File "E:\MingGuangSoft\LSTM\LSTM-Neural-Network-for-Time-Series-Prediction-master\run.py", line 92, in
main()
File "E:\MingGuangSoft\LSTM\LSTM-Neural-Network-for-Time-Series-Prediction-master\run.py", line 75, in main
save_dir=configs['model']['save_dir']
File "E:\MingGuangSoft\LSTM\LSTM-Neural-Network-for-Time-Series-Prediction-master\core\model.py", line 84, in train_generator
workers=1
File "D:\Anaconda\envs\LSTM_py3.5\lib\site-packages\keras\legacy\interfaces.py", line 91, in wrapper
return func(*args, **kwargs)
File "D:\Anaconda\envs\LSTM_py3.5\lib\site-packages\keras\engine\training.py", line 1415, in fit_generator
initial_epoch=initial_epoch)
File "D:\Anaconda\envs\LSTM_py3.5\lib\site-packages\keras\engine\training_generator.py", line 177, in fit_generator
generator_output = next(output_generator)
File "D:\Anaconda\envs\LSTM_py3.5\lib\site-packages\keras\utils\data_utils.py", line 785, in get
raise StopIteration()
StopIteration
Exception ignored in: <bound method BaseSession.del of <tensorflow.python.client.session.Session object at 0x000002105FC55390>>
Traceback (most recent call last):
File "D:\Anaconda\envs\LSTM_py3.5\lib\site-packages\tensorflow\python\client\session.py", line 686, in del
TypeError: 'NoneType' object is not callable