Because I found one.

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FATAL ERROR in
action number 1
of  Step Event0
for object par_monster:

Variable par_monster.type_dir(100217, -2147483648) not set before reading it.
at gml_Object_par_monster_Step_0
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stack frame is
gml_Object_par_monster_Step_0 (line -1)

Thanks for the bug report! I'm not sure why that is happening to you, do you have the latest version available?

At the time and currently I do.