Created attachment 290060 [details]
A short test tone FLAC file with no tags.

I'm using the unstable EasyTAG from the developer's PPA -- https://launchpad.net/~amigadave/+archive/ubuntu/easytag-unstable -- per https://mail.gnome.org/archives/easytag-list/2014-November/msg00001.html

This version is labeled 2.3.1 in the about dialog.

Here's how to make EasyTAG 2.3.1 crash:

1. Create a FLAC audio file (I used Audacity to make a short audio file of a test tone and I've attached this file). Specify that no tags are filled in (in Audacity, simply accept the default set of empty tags and Audacity won't write any tags).

2. Verify that the FLAC file has no tags listed:
  metaflac --list --block-type=VORBIS_COMMENT foobar.flac
should return "comments: 0".

3. Put the FLAC file in a folder and open that folder with EasyTAG:
  mkdir foobarfolder
  mv foobar.flac foobarfolder/
  easytag foobarfolder

EasyTAG 2.3.1 crashes when scanning the file.