AUTO BUG REPORT: could not convert string to float: 'a'

[CALOAReportSender]

Traceback (most recent call last):
  File "C:\Users\pixel\AppData\Local\Programs\Python\Python36\lib\tkinter\__init__.py", line 1702, in __call__
    return self.func(*args)
  File "application.py", line 599, in set_black
    p_T = float(self.config_dict[self.INT_T_ID].get())
ValueError: could not convert string to float: 'a'