Error dragging email to sorter

Was going through old emails (Version 9.1 (3096.5)) and dragging emails to the sorter. Got to 49 in the inbox and the next email that I dragged popped up with this incredibly useful error message :slight_smile:

*** -[__NSPlaceholderDictionaryinitWithObjects:forKeys:count:]: attempt to insert nil object from objects[0]

The email did, however, appear in the inbox

Version is DTPO 2.8.7, OSX 10.11.1

Edit: Looks like it is only one specific email causing the problem

Could you please redirect or export, zip & send this message to cgrunenberg - at - so that we can reproduce this? Thanks in advance!