1 files changed, 3 insertions, 1 deletions
diff --git a/gc.c b/gc.c
index 4a96127bf2..92f2e37e17 100644
--- a/gc.c
+++ b/gc.c
@@ -2501,7 +2501,9 @@ obj_free(rb_objspace_t *objspace, VALUE obj)
       case T_MODULE:
       case T_CLASS:
 	rb_clear_cache_by_class((VALUE)obj);
-	rb_free_m_table(RCLASS_M_TBL(obj));
+        if (RCLASS_M_TBL(obj)) {
+            rb_free_m_table(RCLASS_M_TBL(obj));
+        }
 	if (RCLASS_IV_TBL(obj)) {
 	    st_free_table(RCLASS_IV_TBL(obj));
 	}