Stop Iteration Error

[quest]

The StopIteration exception does not necessarily mean an error. It is the way Python indicates the end of a sequence when you call the next() function. It may simply mean that there are no more items in the sequence.

how can I pass it? because really I do not want to see it. It appears the line of

tq, q = next(self.incoming)

then it is going next function and then stop iteration...
How to manage with that because I change nothing in the code and sometimes it is perfectly fine but sometimes "StopItreration" and ot is very annoying since I change nothing...