Does the developer check here for bug reports? There's an issue with having Iris live with you during the harem route on day 139
ScriptError: could not find label 'extra_scene_18'.
File "day139.rpyc", line 658 in script call
file "Path/To/GameFolder/renpy/ast.py", line 1422 in execute
rv=renpy.game.context().call(label, return_site=self.next.name)
file "day139.rpyc", line 658 in script call
file "Path/To/GameFolder/renpy/script.py", line 886, in lookup
raise ScriptError("could not find label'%s'." % str(original))
ScriptError: could not find label 'extra_scene_18'.
Windows-8-6.2.2900
Ren'Py 7.2.2.491
SL 0.20
DATE
Edit: Full Disclosure - I am using the taboo edition patch... so that may be what's out of date/causing the problem