Problem is again with the embedded data, we want to make those local together with their owner ID, but sometimes we are actually dealing with copies here, which are inheritently already local. Code did not considered that possibility before, leading to access to a NULL `lib` pointer. This should also be back-ported to 2.83 LTS release. Maniphest Tasks: T80104 Differential Revision: https://developer.blender.org/D8731