(Edit: Can confirm, this happens with both Hoodie and Mari as playing character. ALSO: Game allows you to keep hitting 'feed' even when at 0 donuts.)
Game version v0.2252026a:
Reached end of first level of endless with Hoodie. Started feeding Mari all the donuts from the level. At Lightyears3 largest size, next 'feed' button press crashed game with this error:
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ERROR in action number 1
of Step Event0 for object o_endl_mari_controller:
Variable Index [1] out of range [0]
at gml_Script_func_update_display_text@gml_Object_o_endl_mari_controller_Create_0
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gml_Script_func_update_display_text@gml_Object_o_endl_mari_controller_Create_0 (line -1)
gml_Script_func_update_display_size@gml_Object_o_endl_mari_controller_Step_0
gml_Object_o_endl_mari_controller_Step_0