The active object can be `NULL`, which causes a segfault in `BKE_object_is_in_editmode(NULL)` (and if that were made NULL-safe, the segfault would happen further down in `object_remesh_poll()`).
The active object can be `NULL`, which causes a segfault in `BKE_object_is_in_editmode(NULL)` (and if that were made NULL-safe, the segfault would happen further down in `object_remesh_poll()`).