What cause this error message?

[turbid magnet]

full error meassage goes as follows *E 0:00:01:0054 _super_implicit_constructor: Parameter "p_script->implicit_initializer" is null.
<C++ Source> modules/gdscript/gdscript.cpp:131 @ _super_implicit_constructor()
*

[near crater]

I'm guessing it has to do with an object's property not being set to a default value? 🤔