diff --git a/src/Mustache/Tokenizer.php b/src/Mustache/Tokenizer.php
index 4a2f06c..1846675 100644
--- a/src/Mustache/Tokenizer.php
+++ b/src/Mustache/Tokenizer.php
@@ -107,7 +107,7 @@ class Mustache_Tokenizer
 
         $this->reset();
 
-        if ($delimiters = trim($delimiters)) {
+        if (is_string($delimiters) && $delimiters = trim($delimiters)) {
             $this->setDelimiters($delimiters);
         }