diff --git a/src/telegram-bot/telegram-bot.service.ts b/src/telegram-bot/telegram-bot.service.ts
index 5f80b07..2254fa3 100644
--- a/src/telegram-bot/telegram-bot.service.ts
+++ b/src/telegram-bot/telegram-bot.service.ts
@@ -30,14 +30,19 @@ export class TelegramBotService {
     this.telegramBotToken = this.configService.get<string>('telegramBotToken');
     this.redminePublicUrlPrefix =
       this.configService.get<string>('redmineUrlPublic');
-    this.initTelegramBot();
+    this.initTelegramBot().catch((ex) => {
+      this.logger.error(`Error at init telegram bot - ${ex}`);
+    });
     this.handlers.push(this.currentIssuesBotHandlerService);
     this.handlers.push(this.setDailyEccmUserCommentBotHandlerService);
   }
 
   private async initTelegramBot(): Promise<void> {
     const Telegram = await require('node-telegram-bot-api');
+    if (!this.telegramBotToken) return;
+    this.logger.debug('Telegram bot instance creation ... ');
     this.bot = new Telegram(this.telegramBotToken, { polling: true });
+    this.logger.debug('Telegram bot instance created');
     this.bot.onText(/\/start/, async (msg) => {
       await this.showHelpMessage(msg);
     });
@@ -50,6 +55,12 @@ export class TelegramBotService {
     this.bot.onText(/\/leave/, async (msg) => {
       await this.leave(msg);
     });
+    this.bot.on('polling_error', (error) => {
+      this.logger.error(`polling_error from telegram bot instance - ${error}`);
+    });
+    this.bot.on('webhook_error', (error) => {
+      this.logger.error(`webhook_error from telegram bot instance - ${error}`);
+    });
     for (let i = 0; i < this.handlers.length; i++) {
       const handler = this.handlers[i];
       await handler.init(this, this.bot);
@@ -57,6 +68,7 @@ export class TelegramBotService {
   }
 
   private async showHelpMessage(msg: TelegramBot.Message): Promise<void> {
+    if (!this.telegramBotToken) return;
     const userMetaInfo = await this.userMetaInfoService.findByTelegramId(
       msg.chat.id,
     );
@@ -81,7 +93,11 @@ export class TelegramBotService {
       `Sent help message for telegramChatId = ${msg.chat.id}, ` +
         `message = ${helpMessage}`,
     );
-    this.bot.sendMessage(msg.chat.id, helpMessage);
+    try {
+      this.bot.sendMessage(msg.chat.id, helpMessage);
+    } catch (ex) {
+      this.logger.error(`Error at send help message - ${ex?.message}`);
+    }
   }
 
   async sendMessageByRedmineId(
@@ -89,6 +105,7 @@ export class TelegramBotService {
     msg: string,
     options?: TelegramBot.SendMessageOptions,
   ): Promise<boolean> {
+    if (!this.telegramBotToken) return false;
     const userMetaInfo = await this.userMetaInfoService.findByRedmineId(
       redmineId,
     );
@@ -110,6 +127,7 @@ export class TelegramBotService {
     msg: string,
     options?: TelegramBot.SendMessageOptions,
   ): Promise<boolean> {
+    if (!this.telegramBotToken) return false;
     const user = await this.usersService.findUserByName(firstname, lastname);
     if (!user) return false;
     return await this.sendMessageByRedmineId(user.id, msg, options);