Upgrade from 2.1.6 to 2.2 fails

[asdf]

I have a site which does not use table prefix and upgrading from 2.1.6 fails, running on MySQL. The prefix was not needed for 1.x and so far upgrades have worked fine. But "Step 4 - Basic Configuration Information" on 2.2 requires prefix be filled, it fails with error

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Please enter a valid prefix for database tables

The config.php sets it to blank correctly

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$config['db_prefix'] = '';

What to do, other than rename all tables?

[Jos]

I ran into the same problem and chose to edit the table names, but also the names of all the indexes. Some indexes seem to be explicitly called in some scripts, and if you forget to prefix them too, you will only see the active page in the frontend menu.

[asdf]

Thanks for the index tip! As there was no other solution i had to rename tables and indexes.