- XBT_DEBUG("Actor '%s'@%s is killing actor '%s'@%s", issuer->get_cname(),
- (issuer->host_ == nullptr ? "(null)" : issuer->host_->get_cname()), actor->get_cname(),
+ XBT_DEBUG("Actor '%s'@%s is killing actor '%s'@%s", issuer == nullptr ? "(null)" : issuer->get_cname(),
+ (issuer == nullptr || issuer->host_ == nullptr ? "(null)" : issuer->host_->get_cname()), actor->get_cname(),