Comment 2 for bug 1157311

StacktraceTop:
 XUnmapWindow (dpy=0x0, w=w@entry=10497032) at ../../src/UnmapWin.c:39
 wireframeUpdate (c=c@entry=0xb8945fa0, xwindow=10497032) at wireframe.c:56
 clientCycleEventFilter (xevent=0xbfdb8cfc, data=0xbfdb8f28) at cycle.c:337
 eventXfwmFilter (gdk_xevent=0xbfdb8cfc, event=0xb88c4ed8, data=0xb892a098) at event_filter.c:158
 gdk_event_apply_filters (filters=<optimized out>, event=<optimized out>, xevent=<optimized out>) at /build/buildd/gtk+2.0-2.24.16/gdk/x11/gdkevents-x11.c:356