diff --git a/app/admin/controller/v1/SiteConfig.php b/app/admin/controller/v1/SiteConfig.php
index 182be834..5beb92c7 100644
--- a/app/admin/controller/v1/SiteConfig.php
+++ b/app/admin/controller/v1/SiteConfig.php
@@ -91,14 +91,17 @@ class SiteConfig
                 $extra = explode(PHP_EOL, $val['extra']);
                 $val['extra'] = [];
                 foreach ($extra as $v) {
-                    if (preg_match('/^([^:]+):(.+)\[(.+)\]$/i', $v, $match)) {
+                    if (preg_match('/^([^:]+):(.*?)(?:\[(.*?)\])?$/i', $v, $match)) {
                         $item = [
                             'name'          => $match[2],
                             'value'         => $match[1],
-                            'linkage_names' => array_map(function ($it) {
-                                return trim(trim($it), "'");
-                            }, explode(',', $match[3]))
+                            'linkage_names' => [],
                         ];
+                        if (isset($match[3])) {
+                            $item['linkage_names'] = array_map(function ($it) {
+                                return trim(trim($it), "'");
+                            }, explode(',', $match[3]));
+                        }
                         $linkage_names = array_merge($linkage_names, $item['linkage_names']);
                         $val['extra'][] = $item;
                     }