The only way to understand such crashes is to run "valgrind qtella" (after installing valgrind).
The gdb backtrace is unfortunately not useful.

To apply the fix: you need to be able to compile qtella from sources.
Save fulldif.txt into the qtella sources, launch konsole, go to the qtella sources, then type
patch -p0 < fulldif.txt
It should show a list of files successfully modified. Then recompile as usual.