507280 error in SocialEngine when deleting user

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Project Description:
here is the error we see when a user tries to delete his profile.

Fatal error: Call to a member function getNextCollectible() on a non-object in /home/account/public_html/site.com/application/modules/Core/Model/Item/Collectible.php on line 54

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Anything Goes, PHP
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panter011 Spain
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