1871226 /usr/bin/gthumb:gthumb: ../../../../src/cairo-surface.c:930: cairo_surface_reference: Zusicherung \302\273CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&surface->ref_count)\302\253 nicht erf\303\274llt. 1795592 /usr/bin/gthumb:gthumb: ../../../../src/cairo-surface.c:955: cairo_surface_destroy: Assertion `CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&surface->ref_count)' failed. 1721913 /usr/bin/gthumb:gthumb: ../../../../src/cairo-surface.c:956: cairo_surface_destroy: Assertion `CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&surface->ref_count)' failed.