diff --git a/src/http/modules/ngx_http_referer_module.c b/src/http/modules/ngx_http_referer_module.c
index 608623f..8daa399 100644
--- a/src/http/modules/ngx_http_referer_module.c
+++ b/src/http/modules/ngx_http_referer_module.c
@@ -506,6 +506,11 @@
     ngx_regex_elt_t  *re;
     u_char            errstr[NGX_MAX_CONF_ERRSTR];
 
+    if (name->len == 1) {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "empty regex in \"%V\"", name);
+        return NGX_CONF_ERROR;
+    }
+
     if (rlcf->regex == NGX_CONF_UNSET_PTR) {
         rlcf->regex = ngx_array_create(cf->pool, 2, sizeof(ngx_regex_elt_t));
         if (rlcf->regex == NULL) {
diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index 3abb0ed..9af59b1 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -3551,6 +3551,12 @@
         ngx_str_t  err;
         u_char     errstr[NGX_MAX_CONF_ERRSTR];
 
+        if (value[i].len == 1) {
+            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                               "empty regex in server name \"%V\"", &value[i]);
+            return NGX_CONF_ERROR;
+        }
+
         err.len = NGX_MAX_CONF_ERRSTR;
         err.data = errstr;