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Same problem here.

Version 0.34, running on Gentoo Linux

When using the line-drawing tool and the time between two
clicks is very short, the program segfaults. The critical
error only sometimes shows up on the error log:

** (sodipodi:PID): CRITICAL **: sp_curve_closepath_current:
assertion `curve->hascpt' failed
** (sodipodi:PID): WARNING **: Emergency save activated
Emergency save locations:
** (sodipodi:PID): WARNING **: Emergency save completed, now
Segmentation fault