- unw_destroy_addr_space(this->unw_underlying_addr_space);
- _UPT_destroy(this->unw_underlying_context);
+ if (this->unw_underlying_addr_space)
+ unw_destroy_addr_space(this->unw_underlying_addr_space);
+ if (this->unw_underlying_context)
+ _UPT_destroy(this->unw_underlying_context);