crash don't know what it is and/or how to find a solution

I get:

GtkWarning: gtk_text_attributes_ref: assertion `values != NULL' failed

Pango-CRITICAL **: pango_layout_new: assertion `context != NULL' failed
Segmentation fault

and the app crashes. Where am I supposed to look if I get such output?
[google didn't help]
-- 
Nikos Kouremenos | Jabber ID: nkour@xxxxxxxxxx | http://members.hellug.gr/nkour
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