diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index ac4adea1..bb16a1f5 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -1952,7 +1952,7 @@ class Query
         if (!empty($this->pk)) {
             $pk = $this->pk;
         } else {
-            $pk = $this->getTableInfo(is_array($options) ? $options['table'] : $options, 'pk');
+            $pk = $this->getTableInfo(is_array($options) && isset($options['table']) ? $options['table'] : $options, 'pk');
         }
         return $pk;
     }