Fix the following error in my godot 3 project

Error:
E 0:00:06.623 recover_from_penetration: Condition "shape_idx < 0 || shape_idx >= cs->getNumChildShapes()" is true. Returned: false
<C++-Quellcode>modules/bullet/space_bullet.cpp:1262 @ recover_from_penetration()
<Stacktrace> FPSBasic.gd:135 @ _physics_process()

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