Bruteforce mode stuck at the end

[renatoferreirarenatoferreira]

Using the command:

./bin/python sublist3r.py -d domain.tld -b -t 10 -o out.txt

It finishes with:

[DEBUG] False
[DEBUG] End of work queue
[DEBUG] False
[DEBUG] End of work queue
[DEBUG] False
[DEBUG] End of work queue
[DEBUG] False
[DEBUG] End of work queue
[DEBUG] False
[DEBUG] End of work queue
[DEBUG] False
[DEBUG] End of work queue
[DEBUG] False
[DEBUG] End of work queue
[DEBUG] False
[DEBUG] End of work queue
[DEBUG] False
[DEBUG] End of work queue

After that I have to kill the process and the output file is not written.

With those nine queues ending, isn't it waiting forever for the tenth one?