Mac build - assertion error when quitting

[hn-88]

    File:       /Users/runner/source/OpenSpace/ext/ghoul/include/ghoul/misc/objectmanager.inl, line 109
    Function:   void ghoul::ObjectManager<ghoul::opengl::ProgramObject>::release(const std::string &, const DestructionCallback &) [T = ghoul::opengl::ProgramObject]
    Assertion:  it != _objects.end()    Could not find object 'ModelProgram'
(I)gnore / Ignore (P)ermanently / (A)ssertion / (S)tacktrace / (E)xit: P

Need to check if this is the same as the occasional crashes (core dumped messages) seen on Linux when quitting OpenSpace.