I can reproduce as follows:
1. Start a fresh LyX session.
2. Open a new document.
3. Save (or Save As).

I get the following messages:

Saving document ~/newfile1.lyx...
Saving document ~/newfile1.lyx... done.
Document ~/newfile1.lyx reloaded.
(buffer-write: Ctrl+S, F2)Undo.cpp (515): There is no undo group to end here

On a different note, shouldn't there be a line break in the last line after 
(buffer-write: Ctrl+S, F2)?

git bisect leads me here:
bbbc2b654175edbccb1ce54ae6dbb15f8a042360

which is related to this ticket:
http://www.lyx.org/trac/ticket/8159

Scott

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