Bug in version 1.5.058

[sorento]

When you change custom fields in Database/Custom fields settings/
 to zero and try to save any change in the metadata PDF Explorer will show error message.

The same happens when you install version 1.5.058 over 1.5.057 and you have custom field set up to zero.

[RTT]

Fixed
This fix, and some others, will be available with the build 58 patch 1, to be released next week and distributed through automatic updates, Help>CheckForUpdates>CheckNow.
Meanwhile, keep at least one custom field in the list. Database>CustomFieldsSettings.
By default, the number of custom fields is set to 10, so, this bug will only affect users that manually zeroed this number.