[BUG] with org-agenda not loading properly after the diff command

[rameiko87]

In Emacs, display org-agenda then press key n to show TODOs and agenda. 
Now execute M-x diff between an Org file file.org and file.org~

Then do M-x org-agenda and press n again.


Expected result:

Your agenda!



Obtained result:

Search failed: "\\<SCHEDULED: *<\\([^>]+\\)>" and the agenda stays 
empty.