dwg_decode_eed in decode.c in GNU LibreDWG before 0.6 leads to a double free (in dwg_free_eed in free.c) because it does not properly manage the obj->eed value after a free occurs.
This issue has been resolved in the latest release of libredwg-0.6. See https://savannah.gnu.org/forum/forum.php?forum_id=9211.