for me the game crashes when I want to enter that one dungeon
in the lower gray area on the map, left of the purple area.
the second I enter the dungeon (the swirling animation plays) game crashes showing this message:
"

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ERROR in action number 1

of Other Event: Room Start for object obj_control:

Variable <unknown_object>.col_space(103783, -2147483648) not set before reading it.

at gml_Object_obj_control_Other_4

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gml_Object_obj_control_Other_4 (line -1)"