[Tickets #12140] The 'Mark as' context menu causes an error for IE8

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Ticket URL: http://bugs.horde.org/ticket/12140
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  Ticket             | 12140
  Created By         | aarno.sandvik at helsinki.fi
  Summary            | The 'Mark as' context menu causes an error for IE8
  Queue              | IMP
  Version            | 6.0.4
  Type               | Bug
  State              | Unconfirmed
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             |
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aarno.sandvik at helsinki.fi (2013-03-26 07:18) wrote:

On the initial page load IE8 users are unable to mark messages as  
Flagged for followup or seen/unseen. If they try to access the 'Mark  
as' context menu they encounter an error:

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1;  
Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR  
3.0.4506.2152; .NET CLR 3.5.30729; InfoPath.3; .NET4.0C; .NET4.0E)
Timestamp: Tue, 26 Mar 2013 07:03:19 UTC

Message: 'null' is null or not an object
Line: 1441
Char: 9
Code: 0
URI: https://x/horde/imp/js/dimpbase.js?v=36100e84295ef406dc3fc18b31b484fc


This only happens on the initial page load. If you refresh the page  
the problem doesn't occur. If you logout and log in again the problem  
doesn't occur.