Drupal shows warnings after migrating to new server

Recently we migrated a Drupal managed website to  a new server. РEverything was fine, just on some pages, some php-warnings showed up that did not show up on the original site.
After some investigation I checked php’s error_reporting setting and realized that the settings of the new new server were more sensitive than the old one.

The solution was pretty simple. As I definately didn’t want to start hacking around in Drupal, I just turned off showing the errors to the user:

Administer > Site configuration > Error reporting
(or in german:) Verwalten > Einstellungen > Error reporting
/admin/settings/error-reporting
Error Reporting: Write errors to the log (instead: Write errors to the log and to the screen).

Pretty easy.