GM Code Error

[fdeitylink]

Got a code error in the middle of playing unmodified version

ERROR in
action number 1
of Step Eventobj_turtle1
for object obj_projectile_player:

Error in function arcsin().
at gml_Script_angle_precision

---

stack frame is
gml_Script_angle_precision (line 0)
gml_Object_obj_projectile_player_Collision_76

Not sure how much of this is useful to you (usually my errors are different kinds when I make games), so I thought I'd just paste the whole thing.
I forget when I got the error, I think I threw a bomb at the wall, but I'm not sure