&& (hdr->thread->parent && hdr->thread->parent->message
&& hdr->thread->parent->message->env->x_label))
htmp = hdr->thread->parent->message;
- if (htmp && mutt_strcasecmp (hdr->env->x_label,
+ if (htmp && safe_strcasecmp (hdr->env->x_label,
htmp->env->x_label) == 0)
i = 0;
}