diff --git a/library/think/Validate.php b/library/think/Validate.php
index cb113bc2..d68811f0 100644
--- a/library/think/Validate.php
+++ b/library/think/Validate.php
@@ -1215,7 +1215,7 @@ class Validate
             $msg = Lang::get(substr($msg, 2, -1));
         }
 
-        if (is_string($msg) && false !== strpos($msg, ':')) {
+        if (is_string($msg) && is_string($rule) && false !== strpos($msg, ':')) {
             // 变量替换
             if (strpos($rule, ',')) {
                 $array = array_pad(explode(',', $rule), 3, '');