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Created attachment 8522 [details]
I believe it depends on the Pads' docking state as it didn't happen before I changed some dock layout locally.
With my docking state[*1] it causes crash when I operate "Find References" on C# source file in the text editor.
Repro (possibly with anything, but this is my reproducible steps):
1. git clone https://github.com/atsushieno/cadencii.git
2. git checkout 93ab6418c7f47a44fd19b5d9fa1370cd98a7dcaf
3. open Cadencii.sln. There is nothing opened by default (i.e. no saved state in *.userprefs)
4. open src/Cadencii.Application.Model/AuthorListEntry.cs.
5. right click "AuthorListEntry" at line 20 and operate "Find References" command.
It results in error:
System.NullReferenceException: Object reference not set to an instance of an object
at MonoDevelop.Components.Docking.DockBarItem.<Present>m__2 () [0x00027] in /svn/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Components.Docking/DockBarItem.cs:278
at GLib.Timeout+TimeoutProxy.Handler () [0x0000f] in /svn/gtk-sharp/glib/Timeout.cs:70
[*1] My ~/config/MonoDevelop-5.0/EditingLayout.xml was: https://gist.github.com/atsushieno/b352207d6798aea87b84
Created attachment 8523 [details]