Selecting Chapters menu triggers this:
File "game/screens.rpy", line 350, in execute File "game/screens.rpy", line 350, in execute File "game/screens.rpy", line 355, in execute File "game/screens.rpy", line 355, in <module> TypeError: '>=' not supported between instances of 'NoneType' and 'int'
And when the title screen for Chapter 7. Part 2. appears, it triggers this:
File "game/chapter20.rpy", line 31, in <module> TypeError: '>' not supported between instances of 'int' and 'NoneType'