diff --git a/src/stats.c b/src/stats.c
index 0a0ed1d..e04ae92 100644
--- a/src/stats.c
+++ b/src/stats.c
@@ -283,7 +283,7 @@
 		struct ist uri;
 
 		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);
 		uri = htx_sl_req_uri(htx_get_blk_ptr(htx, blk));
 		p = uri.ptr;