RuntimeError: maximum recursion depth exceeded while calling a Python object

I encountered this error when using sushi with the default settings on episode 17 of Magi The Kingdom of Magic.
```
File "subs.py", line 33, in diff
RuntimeError: maximum recursion depth exceeded while calling a Python object
Failed to execute script sushi
```
Example .ass file with src and dst audio https://drive.google.com/file/d/173aB7Lw-s3yJb2pnenFujC5AIVeJ0Ciu/view?usp=sharing

