Comment 2 for bug 1234241

StacktraceTop:
 __exchange_and_add (__val=-1, __mem=0x2d5efd0) at /usr/include/c++/4.8/ext/atomicity.h:49
 __exchange_and_add_dispatch (__val=-1, __mem=0x2d5efd0) at /usr/include/c++/4.8/ext/atomicity.h:82
 _M_dispose (__a=..., this=0x0) at /usr/include/c++/4.8/bits/basic_string.h:246
 ~basic_string (this=0x7fff6ccd77b0, __in_chrg=<optimized out>) at /usr/include/c++/4.8/bits/basic_string.h:539
 CompAction::ButtonBinding::toString (this=<optimized out>) at /build/buildd/compiz-0.9.10+13.10.20131004/src/action.cpp:310