Safari Crash - Problem with doodle (planer) app - doodle web links cause safari to crash with a very strange message "Error - Please make sure Safari is not used in Private Modus" (translated from german) What the **** is a Privat Modus in Safari?

Safari Crash - Problem with doodle (planer) app - doodle web links cause safari to crash with a very strange message "Error - Please make sure Safari is not used in Private Modus" (translated from german). What the **** is a Privat Modus in Safari? You can see the web site working in the backround. But if you click on the error window Safari crashes. With an older safari version everything works fine. doodle app was called and i could edit alle event in the doodle app. Now i could not do anything. Not even the normal web stuff.

Any suggestion?