nginx 0.4.10 *) Feature: the POP3 proxy supports the APOP command. *) Bugfix: if the select, poll or /dev/poll methods were used, then while waiting authentication server response the IMAP/POP3 proxy hogged CPU. *) Bugfix: a segmentation fault might occur if the $server_addr variable was used in the "map" directive. *) Bugfix: the ngx_http_flv_module did not support the byte ranges for full responses; bug appeared in 0.4.7. *) Bugfix: nginx could not be built on Debian amd64; bug appeared in 0.4.9.

--- a/src/http/modules/ngx_http_map_module.c
+++ b/src/http/modules/ngx_http_map_module.c
@@ -115,6 +115,11 @@ ngx_http_map_variable(ngx_http_request_t
 
     vv = ngx_http_get_flushed_variable(r, map->index);
 
+    if (vv == NULL || vv->not_found) {
+        *v = *map->default_value;
+        return NGX_OK;
+    }
+
     len = vv->len;
 
     if (len && map->hostnames && vv->data[len - 1] == '.') {