Crash reproduced with Inkscape 0.48.1 and 0.48+devel r10412 on Mac OS X 10.5.8 (i386)
Steps to reproduce:
1) switch to text tool ('T')
2) click on canvas and enter a text
3) switch focus to font family selector ('Alt+X')
4) delete current family name (<Del> or <Backspace>)
5) confirm empty string with <Return>
Crash reproduced with Inkscape 0.48.1 and 0.48+devel r10412 on Mac OS X 10.5.8 (i386)
Steps to reproduce:
1) switch to text tool ('T')
2) click on canvas and enter a text
3) switch focus to font family selector ('Alt+X')
4) delete current family name (<Del> or <Backspace>)
5) confirm empty string with <Return>
-> crash