This bug was fixed in the package gnome-font-viewer - 3.14.0-2
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gnome-font-viewer (3.14.0-2) unstable; urgency=medium
* Cherry-pick an upstream patch to fix a crash when operating on certain
invalid files (Closes: #781229) (LP: #1436736)
-- Sebastien Bacher
The issue has been fixed upstream in https://git.gnome.org/browse/gnome-
font-viewer/commit/src/font-
thumbnailer.c?id=9d4ec7300bbe57c2ebf36d292f6b574f27325fbc
** Changed in: gnome-font-viewer (Ubuntu)
Importance: Undecided = High
** Changed in: gnome-font-viewer (Ubuntu)
Status:
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-font-viewer (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/1436736