Hello.
I am trying to update to version 5.1.3 + 210817 and the update process fails when I try to update the database. I get the following error:
During the update, a non-recoverable error occurred. Details of the error: CDbCommand failed to execute the SQL statement: SQLSTATE [23000]: Integrity constraint violation: 1062 Duplicate entry '1212-es' for key 'lime_idx1_label_l10ns' Update_helper.php file, line 33
There have been a couple reports of similar errors here in the forum, have a read. As far as I know, this problem should be solved. Below your post are a couple of other posts with bug reports and description. Have a read there.
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Provide your LS version and where it is installed (own server, uni/employer, SaaS hosting, etc.).
Always provide a LSS file (not LSQ or LSG).
Note: I answer at this forum in my spare time, I'm not a LimeSurvey GmbH employee.