diff --git a/dblayer.php b/dblayer.php
index b18aeac..550108e 100644
--- a/dblayer.php
+++ b/dblayer.php
@@ -480,7 +480,7 @@ class dblayer
     }
 
     // Check if the foreign keys constrains are valid before doing the insertion
-    foreach ($this->foreign as $foreign=>$data)
+    foreach ($this->foreign as $foreign=>$d)
     {
       if ($updatekey === false)
       {
@@ -505,11 +505,11 @@ class dblayer
       }
       else
       {
-        if (! array_key_exists ($foreign, $data))
+        if (! array_key_exists ($foreign, $d))
           continue;
       }
-      $table = $data[0];
-      $column = $data[1];
+      $table = $d[0];
+      $column = $d[1];
       $req = "SELECT $this->sep$column$this->sep ".
              "FROM $this->sep$this->tableprefix$table$this->sep ".
              "WHERE $this->sep$column$this->sep=:".md5 ($column);