Gschem crashes when viewing dir with incompatible .sch files

[Ptolom]

If you try to load a KiCAD .sch file, or even point the "Open File" dialogue at a directory containing one, GSchem crashes:

Read garbage in [/home/hugh/gschem_test/test.sch] :
>>
EESchema Schematic File Version 2 date Wed Dec 5 17:20:42 2012
<<
Read garbage in [/home/hugh/gschem_test/test.sch] :
>>
EELAYER 25 0
<<
Read garbage in [/home/hugh/gschem_test/test.sch] :
>>
EELAYER END
<<
Read garbage in [/home/hugh/gschem_test/test.sch] :
>>
$Descr A4 11700 8267
<<
Read garbage in [/home/hugh/gschem_test/test.sch] :
>>
encoding utf-8
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Read garbage in [/home/hugh/gschem_test/test.sch] :
>>
Sheet 1 1
<<
**
ERROR:o_text_basic.c:422:o_text_read: assertion failed: (num_lines && num_lines > 0)
Aborted (core dumped)