Error after choosing "Reprimand her" in Sayori's route

[FirH]

More accurately after the dialouge "I win every round, save for the first one where i let her win, and before we know it it's time for her to go"

Here's the traceback

[code]
I'm sorry, but an uncaught exception occurred.

While running game code:
File "game/script.rpy", line 45, in script call
File "game/script-ch4.rpy", line 42, in script call
File "game/script-ch4.rpy", line 431, in script call
File "game/sayoriroute.rpy", line 820, in script
ValueError: Empty attribute in format string

-- Full Traceback ------------------------------------------------------------

Full traceback:
File "game/script.rpy", line 45, in script call
File "game/script-ch4.rpy", line 42, in script call
File "game/script-ch4.rpy", line 431, in script call
File "game/sayoriroute.rpy", line 820, in script
File "D:\Steam\steamapps\common\Doki Doki Literature Club\renpy\ast.py", line 613, in execute
renpy.exports.say(who, what, interact=self.interact)
File "D:\Steam\steamapps\common\Doki Doki Literature Club\renpy\exports.py", line 1147, in say
who(what, interact=interact)
File "D:\Steam\steamapps\common\Doki Doki Literature Club\renpy\character.py", line 868, in call
what = what_pattern.replace("[what]", sub(what, translate=translate))
File "D:\Steam\steamapps\common\Doki Doki Literature Club\renpy\character.py", line 850, in sub
return renpy.substitutions.substitute(s, scope=scope, force=force, translate=translate)[0]
File "D:\Steam\steamapps\common\Doki Doki Literature Club\renpy\substitutions.py", line 232, in substitute
s = formatter.vformat(s, (), kwargs)
File "/home/tom/ab/x64lucid-deps/install/lib/python2.7/string.py", line 563, in vformat
File "/home/tom/ab/x64lucid-deps/install/lib/python2.7/string.py", line 585, in _vformat
File "/home/tom/ab/x64lucid-deps/install/lib/python2.7/string.py", line 650, in get_field
ValueError: Empty attribute in format string

Windows-8-6.2.9200
Ren'Py 6.99.12.4.2187
Doki Doki, The Normal VN! 1.5.0
[/code]