Calendar crash when clicking on event
- /e/OS version: 3.7t-official
- Device model(s): Fairphone 3+
- Impacted Application: ~"/e/OS Calendar"
- Affected application: foundation.e.calendar
## The problem
When trying to open the detail view of a repeating event, the app crashes. Other entries, e.g. from a Nextcloud calendar or Zimbra one time events work.
1. Open the standard /e/OS calendar
2. Find a calendar entry which repeats from a [Zimbra](https://www.zimbra.com/) calendar entry
3. Try to open the detail view when clicking on it --> crash
## Technical details
```
2026-04-21 22:23:26.835 16488-16488 AndroidRuntime foundation.e.calendar E FATAL EXCEPTION: main (Fix with AI)
Process: foundation.e.calendar, PID: 16488
com.android.calendarcommon2.EventRecurrence$InvalidFormatException: Invalid integer value: WE
FREQ=WEEK
at com.android.calendarcommon2.EventRecurrence$PartParser.parseIntRange(EventRecurrence.java:689)
at com.android.calendarcommon2.EventRecurrence$ParseByDay.parseWday(EventRecurrence.java:835)
at com.android.calendarcommon2.EventRecurrence$ParseByDay.parsePart(EventRecurrence.java:810)
at com.android.calendarcommon2.EventRecurrence.parse(EventRecurrence.java:627)
at com.android.calendar.EventInfoFragment.updateEvent(EventInfoFragment.java:1576)
at com.android.calendar.EventInfoFragment.-$$Nest$mupdateEvent(Unknown Source:0)
at com.android.calendar.EventInfoFragment$QueryHandler.onQueryComplete(EventInfoFragment.java:2436)
at com.android.calendar.AsyncQueryService.handleMessage(AsyncQueryService.java:357)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7924)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
```
issue