disable error_page loop in 500 error when recursive errors are enabled

src/http/ngx_http_special_response.c

diff --git a/src/http/ngx_http_special_response.c b/src/http/ngx_http_special_response.c
index 6127149..fd33eaf 100644
--- a/src/http/ngx_http_special_response.c
+++ b/src/http/ngx_http_special_response.c
@@ -371,7 +371,7 @@
 
     clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
 
-    if (!r->error_page && clcf->error_pages) {
+    if (!r->error_page && clcf->error_pages && r->uri_changes != 0) {
 
         if (clcf->recursive_error_pages == 0) {
             r->error_page = 1;