diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 23208c8..7066d14 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -3751,11 +3751,15 @@
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                    "finalize http upstream request: %i", rc);
 
-    if (u->cleanup) {
-        *u->cleanup = NULL;
-        u->cleanup = NULL;
+    if (u->cleanup == NULL) {
+        /* the request was already finalized */
+        ngx_http_finalize_request(r, NGX_DONE);
+        return;
     }
 
+    *u->cleanup = NULL;
+    u->cleanup = NULL;
+
     if (u->resolved && u->resolved->ctx) {
         ngx_resolve_name_done(u->resolved->ctx);
         u->resolved->ctx = NULL;