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Undefined index: cust_group in AbstractGroupPrice.php

Undefined index: cust_group in AbstractGroupPrice.php

when a client is updating a product they get the following error

 

 Undefined index: cust_group in vendor/magento/module-catalog/Model/Product/Attribute/Backend/GroupPrice/AbstractGroupPrice.php on line 171

 

They are using 2.1.8

 

Any ideas what might be causing it?