I'm trying to add a configurable product, but after generating configurations and saving the the product I get the following error:

SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '402-2154' for key 'CATALOG_PRODUCT_SUPER_LINK_PRODUCT_ID_PARENT_ID', query was: INSERT INTO `catalog_product_super_link` (`product_id`,`parent_id`) VALUES (?, ?), (?, ?)

Despite of the error, the Configurable product is saved. The main problem is, that sometimes, not always, all relationships for all products are cleared, so when I add configurable product I loose all categories, custom attributes relationships and so on.

Did anyone encounter this problem? How can it be related to the Duplicate entry error?

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