diff --git a/src/mux_h2.c b/src/mux_h2.c
index a0fb93d..fd039d1 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -4586,7 +4586,7 @@
 
 	/* get the start line, we do have one */
 	blk = htx_get_head_blk(htx);
-	BUG_ON(htx_get_blk_type(blk) != HTX_BLK_RES_SL);
+	BUG_ON(!blk || htx_get_blk_type(blk) != HTX_BLK_RES_SL);
 	ALREADY_CHECKED(blk);
 	sl = htx_get_blk_ptr(htx, blk);
 	h2s->status = sl->info.res.status;
@@ -4795,7 +4795,7 @@
 
 	/* get the start line, we do have one */
 	blk = htx_get_head_blk(htx);
-	BUG_ON(htx_get_blk_type(blk) != HTX_BLK_REQ_SL);
+	BUG_ON(!blk || htx_get_blk_type(blk) != HTX_BLK_REQ_SL);
 	ALREADY_CHECKED(blk);
 	sl = htx_get_blk_ptr(htx, blk);
 	meth = htx_sl_req_meth(sl);