On Mar 5, 2012, at 10:01 PM, Gideon King <gid...@novamind.com> wrote:

> Ah, of course - silly me. Working on assumptions instead of using my eyes.
> 
> So the relevant code is this:
>            NSMapInsertKnownAbsent(windowsForSheets, sheet, docWindow);
> and seeing as windowForSheets is created with:
>    windowsForSheets = NSCreateMapTable(NSObjectMapKeyCallBacks, 
> NSObjectMapValueCallBacks, 0);
> and NSObjectMapKeyCallBacks has a nil notAKeyMarker…
> 
> So if the sheet is nil, then an exception is raised. Not sure how that would 
> be possible in my code, but at least I now understand what is going on.

If your further research doesn't point to an obvious error on your part, please 
file an issue on our GitHub project: 
https://github.com/omnigroup/OmniGroup/issues

--Kyle Sluder
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