diff --git a/src/mux_h2.c b/src/mux_h2.c
index d72ca70..ac54023 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -2732,6 +2732,10 @@
 			break;
 
 		h2s->flags &= ~H2_SF_BLK_ANY;
+
+		if (LIST_ADDED(&h2s->sending_list))
+			continue;
+
 		/* For some reason, the upper layer failed to subscribe again,
 		 * so remove it from the send_list
 		 */