No crash in Inkscape 0.48.2 and 0.48+devel r10992 after deleting this object:
<path style="fill:none;stroke:#000000;stroke-width:nan;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;marker-end:url(#Arrow2Lend)" d="m 105.71421,115.82283 0,159.99998" id="path4480" inkscape:connector-curvature="0" />
No crash in Inkscape 0.48.2 and 0.48+devel r10992 after deleting this object:
<path
style=" fill:none; stroke: #000000; stroke- width:nan; stroke- linecap: butt;stroke- linejoin: miter;stroke- miterlimit: 4;stroke- opacity: 1;stroke- dasharray: none;marker- end:url( #Arrow2Lend) "
id="path4480"
inkscape: connector- curvature= "0" />
d="m 105.71421,115.82283 0,159.99998"