diff --git a/src/mux_h2.c b/src/mux_h2.c
index a5232d0ca..ab2e5bfe9 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -5577,7 +5577,7 @@ static void h2_detach(struct sedesc *sd)
 
 	h2s_destroy(h2s);
 
-	if (h2c->flags & H2_CF_IS_BACK) {
+	if (h2c->flags & H2_CF_IS_BACK && !h2c_is_dead(h2c)) {
 		if (!(h2c->flags & (H2_CF_RCVD_SHUT|H2_CF_ERR_PENDING|H2_CF_ERROR))) {
 			/* Ensure idle-ping is activated before going to idle. */
 			if (eb_is_empty(&h2c->streams_by_id) &&