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Mysql duplicate entry problem, upgrading from v4.2.2


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SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '1-1-invoiced_today_proforma' for key 'PRIMARY'

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Hello everyone.

Recently I've got the above browser error message in the middle of upgrading process (~/admin/upgrade/process/) from version 4.2.2

The same message also appears if I'm trying to upgrade any core plugins in the admin dashboard.

I'm using Apache 2.4.34 + PHP 5.6.36 + Mysql 5.7.22-cll-lve

Can I have any solutions to fix this problem? Thanks.

 

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