[cairo] wxWidgets-application fails in some cairo code

[Satz Klauer]

Hi everybody,

I have a wxWidgets-based application that works well except on one
particular system (which is a Debian Squeeze ARM). When I start this
application it sometimes fails with

/build/buildd-cairo_1.8.10-6-armel-lvrFv3/cairo-1.8.10/src/cairo-skiplist.c:476:
_cairo_skip_list_delete_given: Assertion `elt == given' failed.

When looking into cairo-skiplist.c there is a statement assert (elt ==
given) which should not be active in release-builds, so why is it
aborting my application?

And more than this: what could be the general reason for this assertion?

Thanks!