Seen on Ubuntu linux trusty, with Libreoffice packages from Libreoffice.org (not those from the distribution).
May be an issue with Libreoffice.
May be a change in how Libreoffice does things.
May be an issue with LanguageTool that the new version of Libreoffice makes evident.
Crossposting here for reference.
A bug report has been opened on Libreoffice, but they may not give great attention to it since it is related to an unofficial extension.
See 85478 – Libreoffice 4.3.3 segfaults on closing when gnome-integration is not installed
Sad fact is that since Libreoffice 4.4.3 RC2 Languagetool cannot be used.