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-rw-r--r--src/http/ngx_http_upstream.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 9570ccc7e..c148f38d0 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -4555,7 +4555,8 @@ ngx_http_upstream_cache_last_modified(ngx_http_request_t *r,
{
u_char *p;
- if (!r->upstream->conf->cache_revalidate
+ if (r->upstream == NULL
+ || !r->upstream->conf->cache_revalidate
|| r->upstream->cache_status != NGX_HTTP_CACHE_EXPIRED
|| r->cache->last_modified == -1)
{