Some examples:
pywikibot.exceptions.UnknownSite: Language 'eml' does not exist in family wiktionary <class 'pywikibot.exceptions.UnknownSite'> CRITICAL: Closing network session.
pywikibot.exceptions.UnknownSite: Language 'ltg' does not exist in family wiktionary <class 'pywikibot.exceptions.UnknownSite'> CRITICAL: Closing network session.
pywikibot.exceptions.UnknownSite: Language 'crh' does not exist in family wiktionary <class 'pywikibot.exceptions.UnknownSite'> CRITICAL: Closing network session.
When it's crashing, I have two options, manually remove the wrong link or if it's a link to Incubator or something, add the page in a skipfile, and restart.
On Wiktionaries, where there is between 500k and 2M+ pages, it's really time-consuming...
Thanks.
(I'm using pywikibot 2.0rc4, python 2.7.9 and Debian GNU/Linux)