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After upgrade to error 500 in admin


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When I initially installed prestashop 1.6 the installer said msqli was ok, everything installed fine.

When trying to upgrade today from to using 1-click. The upgrade got no errors

(exept the geolite database-file was not backed up.)


And when going to the front page og backend:


Server error 500


After enabling dev-mode.


Fatal error: Call to undefined method mysqli_result::fetch_all() in /home/usernamehere/public_html/classes/db/DbMySQLi.php on line 112


The back end worked for a while, then I got the same error on front and back. Glad I backed up the whole site manually.

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