1 files changed, 2 insertions, 0 deletions
diff --git a/regcomp.c b/regcomp.c
index 6052dc3d32..68f1c49182 100644
--- a/regcomp.c
+++ b/regcomp.c
@@ -15472,6 +15472,8 @@ S_regclass(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, U32 depth,
     }
 
     if (ret_invlist) {
+        assert(cp_list);
+
         *ret_invlist = cp_list;
         SvREFCNT_dec(swash);