MI Crashes when saving

[Als Ad 0]

hello, just something short here

ive been working on an animation, but now whenever i save the animation, it crashes

heres the error that pops up whenever i try saving

Spoiler

___________________________________________
############################################################################################
FATAL ERROR in
action number 1
of  Step Event0
for object app:

string_length argument 1 incorrect type (unknown) expecting a String (YYGS)
############################################################################################
--------------------------------------------------------------------------------------------
called from - gml_Script_buffer_write_string (line 1)
called from - gml_Script_json_save_value (line 1)
called from - gml_Script_json_save_var (line 1)
called from - gml_Script_project_save_template (line 1)
called from - gml_Script_project_save_objects (line 1)
called from - gml_Script_project_save (line 21)
called from - gml_Script_action_toolbar_save (line 2)
called from - gml_Script_app_update_keyboard (line 33)
called from - gml_Script_app_event_step (line 17)
called from - gml_Object_app_Step_0 (line 0)

any advice?
 

[Mr.Zomka 0]

Are you using Kenimation's latest pack?
If yes, stop using it. That's the only way how I could fix it.