[LyX/2.1.x] If this test fails, then we are about to crash, because we are about to try to access whichever thing we did not find. So do an emergency close of this Buffer. (cherry picked from commit 5e557e7f7688e4af5bbecc49f3f7dda80afde44e)

[Richard Heck]

commit 6f1bba05a544273f60caa5b4a908b25b5ab9a8cf
Author: Richard Heck <rgh...@lyx.org>
Date:   Fri Mar 28 14:47:54 2014 -0400

    If this test fails, then we are about to crash, because we are about
    to try to access whichever thing we did not find. So do an emergency
    close of this Buffer.
    (cherry picked from commit 5e557e7f7688e4af5bbecc49f3f7dda80afde44e)

diff --git a/src/CoordCache.cpp b/src/CoordCache.cpp
index dedd135..6865039 100644
--- a/src/CoordCache.cpp
+++ b/src/CoordCache.cpp
@@ -38,7 +38,7 @@ void lyxbreaker(void const * data, const char * hint, int 
size)
 {
        LYXERR0("break on pointer: " << data << " hint: " << hint
                << " size: " << size);
-       LASSERT(false, return);
+       LBUFERR(false);
 }