Dismissing reminders make eM crash. When restarting, I have to go through the DB corruption verification process

When dismissing on or all reminder, eM client crashes. I get the eM Client Application Error log form suggesting to desccribe what I was doing.
Show error will display:

eM Client (5.0.18025.0)
Windows: Microsoft Windows NT 6.1.7601 Service Pack 1, Framework: 2.0.50727.5472
The following error has occurred:
System.NullReferenceException: Object reference not set to an instance of an object.
(…) and more stuff

Hello,

please send me whole error message to galis@emclient.com together with this URL: https://discourse.emclient.com/emclient/to…

regards
Jan