This is with gdict from gnome-utils-1.2.0-7 from Guinness.
1. type 'spell'
2. click on "Lookup"
3. wait for results
4. click on "Spell"
5. hit "Close" button or wait a bit
Segmentation fault. Works for me with a 100% success rate.
Can't reproduce with gnome-utils-1.2.1-2 nor gnome-utils-1.2.0-7.
Just noticed this bug is very old. Will assume fixed.