Сheck for the existence of target user have been added

src/handlers/dice_handler/dice.rs

@@ -22,8 +22,20 @@ pub async fn dice_handler(bot: Bot, message: Message) -> HandlerResult {
     let handler_entity: HandlerEntity = HandlerEntity::new(bot, message, sender);
 
     let (mute_time, emoji): (TimeMetrics, &str) = (TimeMetrics::Days(dice.value), &dice.emoji);
+
     let target: TargetUser = TargetUser::Reply(handler_entity.message_reciever.clone());
 
+    if !target.exist() {
+        handler_entity
+            .message_sender_builder
+            .text("Нет ответа на сообщение пользователя.")
+            .build()
+            .send(&handler_entity.bot_instance)
+            .await?;
+
+        return Ok(EventReturn::Cancel);
+    }
+
     match emoji {
         "🎲" => {
             mute_member(handler_entity, chat_id, target, (mute_time, DICE_DELAY_MS)).await?;