1251989 - modifying single item of recurring event series fails sometimes

Status: UNCONFIRMED

Description

[dominik]

Created attachment 8724605 [details]
thunderbird-informations-for-bug-fixing.txt

User Agent: Mozilla/5.0 (Windows NT 5.1; rv:44.0) Gecko/20100101 Firefox/44.0
Build ID: 20160210153822

Steps to reproduce:

I have several calendars on google with recurring event series in them.
I installed lightning and provider for google calendar version 2.7.
I connected and synchronized them successfully.
I tried to modify a single event of one of the series.


Actual results:

A small message window appeared : 

"This entry has recently been modified on the server, transmitting the changes will overwrite the changes made on the server. transmit anyway or discard?"

I had not changed anything on this event series or calendar on Google recently.

I choose "transmit anyway". 

Nothing happened. In the error log appeared entries like the following:

Zeitstempel: 29.02.2016 00:54:30
Fehler: [calGoogleCalendar] Modifying item W failed:2152334338: [object Object]
Quelldatei: file:///C:/Dokumente%20und%20Einstellungen/Customer/Anwendungsdaten/Thunderbird/Profiles/zjvpw31f.default/extensions/%7Ba62ef8ec-5fdc-40c2-873c-223b8a6925cc%7D/components/calGoogleCalendar.js
Zeile: 528




Expected results:

No message about recent modification on the Google server should have appeared.
The synchronization should work.

Interestingly, the error happens only in one of my google calendars. In the other calendars, I can modify any event without even beeing asked, whether I want to change a single event or the whole series.

I was not able to point out the difference between the google calendars, why some can be modified and others not.