diff --git a/src/http/ngx_http_special_response.c b/src/http/ngx_http_special_response.c
index 9bf99162b..976543034 100644
--- a/src/http/ngx_http_special_response.c
+++ b/src/http/ngx_http_special_response.c
@@ -454,6 +454,8 @@ ngx_http_filter_finalize_request(ngx_http_request_t *r, ngx_module_t *m,
 
     ngx_http_clean_header(r);
 
+    ctx = NULL;
+
     if (m) {
         ctx = r->ctx[m->ctx_index];
     }