1 files changed, 1 insertions, 1 deletions
diff --git a/src/http/ngx_http_script.c b/src/http/ngx_http_script.c
index 13c57d6d9..e94de7385 100644
--- a/src/http/ngx_http_script.c
+++ b/src/http/ngx_http_script.c
@@ -250,7 +250,7 @@ ngx_http_set_complex_value_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
 
     cv = (ngx_http_complex_value_t **) (p + cmd->offset);
 
-    if (*cv != NULL) {
+    if (*cv != NGX_CONF_UNSET_PTR && *cv != NULL) {
         return "is duplicate";
     }