1 files changed, 1 insertions, 0 deletions
diff --git a/lib/splay.c b/lib/splay.c
index 609b799bf..3ca8678b2 100644
--- a/lib/splay.c
+++ b/lib/splay.c
@@ -223,6 +223,7 @@ int Curl_splayremove(struct Curl_tree *t,
   if(compare(SPLAY_SUBNODE, removenode->key) == 0) {
     /* It is a subnode within a 'same' linked list and thus we can unlink it
        easily. */
+    DEBUGASSERT(removenode->samen != removenode);
     if(removenode->samen == removenode)
       /* A non-subnode should never be set to SPLAY_SUBNODE */
       return 3;