I got the same error as the guy above
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ERROR in
action number 1
of Step Event0
for object obj_structure_mechanical_arm_base:
Variable <unknown_object>.maximum_stack(102131, -2147483648) cannot be resolved.
at gml_Object_obj_structure_mechanical_arm_base_Step_0
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gml_Object_obj_structure_mechanical_arm_base_Step_0 (line -1)
Its related to using the hovering hands. For me it happens seemingly randomly while hands are transporting items from one iron box to another. Destroying the hands thankfully resolves the crash, but makes their usage so risky