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500 error when checking out after update from 1.7.6 to 1.7.7.3


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Hi guys, hope someone can help me with this error.

After updating to 1.7.7.3, I cannot check out. After proccessing payment I get a 500 internal server error.

After enabling debug I got the error:

[PrestaShopException]

Validatiefunctie niet gevonden: isMpn.
at line 1195 in file classes/ObjectModel.php

Any idea? 

 

image.thumb.png.973ec764124933b7cf215c1ce93d10c5.png

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