Fatal db error, but no info in sugarcrm.log

In general 500 errors are logged in your PHP log. See if you can look at your PHP log and find the information you need.
I suspect you have an error in the formulation of a query, or, if you can't access your application at all, a problem with your database connection.

If you can get to your Administration module, you can also set your log level to "Debug" from the Admin->System Settings panel and then check your sugar log again (you will get a LOT of information). 

FrancescaS

Thank you, i found information about solving the issue in the php and mysql logs. It was an issue with a corrupt InnoDB database. It was a development environment, so I dropped the table and recreated it. Not a solution for production, but for development ok.