diff --git a/src/Valitron/Validator.php b/src/Valitron/Validator.php
index e6b7e16..08b6e58 100644
--- a/src/Valitron/Validator.php
+++ b/src/Valitron/Validator.php
@@ -992,7 +992,7 @@ class Validator
                 $i = 1;
                 foreach ($params as $k => $v) {
                     $tag = '{field'. $i .'}';
-                    $label = isset($params[$k]) && !is_array($params[$k]) && isset($this->_labels[$params[$k]]) ? $this->_labels[$params[$k]] : $tag;
+                    $label = isset($params[$k]) && (is_numeric($params[$k]) || is_string($params[$k])) && isset($this->_labels[$params[$k]]) ? $this->_labels[$params[$k]] : $tag;
                     $msg = str_replace($tag, $label, $msg);
                     $i++;
                 }