diff --git a/xdiff.php b/xdiff.php
index 1a77052..734e93e 100644
--- a/xdiff.php
+++ b/xdiff.php
@@ -127,6 +127,8 @@ class xdiff
     if (! is_array ($array2))
       throw new \Exception (
         "Invalid array2 provided to diffArray method : not a array", 406);
+    $array1 = array_values ($array1);
+    $array2 = array_values ($array2);
     $diff = array ();
     $i = 0; // $i is the index for $array1
     $j = 0; // $j is the index for $array2
@@ -134,6 +136,10 @@ class xdiff
     {
       $chunk1 = array ();
       $chunk2 = array ();
+      if (key_exists ($i, $array1) && is_array ($array1[$i]))
+        throw new \Exception ("Can not diff a multidimensional array");
+      if (key_exists ($j, $array2) && is_array ($array2[$j]))
+        throw new \Exception ("Can not diff a multidimensional array");
       if (key_exists ($i, $array1) && key_exists ($j, $array2) &&
           $array1[$i] === $array2[$j])
       {