Got another one (made the mistake of going to the caves again and it happened immediately-- thought that one might have been fixed, or maybe this is a new one):
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FATAL ERROR in
action number 1
of Step Event0
for object oDeck:
local variable l_card(100006, -2147483648) not set before reading it.
at gml_Object_oDeck_Step_0
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stack frame is
gml_Object_oDeck_Step_0 (line -1)