diff --git a/.eslintrc.yml b/.eslintrc.yml
index ba9678d..e2edcf2 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -10,6 +10,3 @@ parserOptions:
 plugins:
   - "@typescript-eslint"
   - "prettier"
-rules: {
-  linebreak-style: ["error", "windows"]
-}
diff --git a/Dockerfile b/Dockerfile
index bdf2317..6c94f64 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,6 +4,7 @@ WORKDIR /bot
 COPY ./src /bot/src
 COPY ./package.json /bot/package.json
 COPY ./package-lock.json /bot/package-lock.json
+COPY ./tsconfig.json /bot/tsconfig.json
 
 RUN apk update
 RUN apk add wget python3 build-base
diff --git a/config/config-sample.yaml b/config/config-sample.yaml
index 1ce3f2d..cf0d017 100644
--- a/config/config-sample.yaml
+++ b/config/config-sample.yaml
@@ -5,7 +5,7 @@ owner_id: 'YOUR_TELEGRAM_ID'
 spam_time: 5 * 60 * 1000 # time (in MS) in which user may send 5 messages
 spam_cant_msg: 5
 
-parse_mode: 'MarkdownV2' # DO NOT CHANGE!
+parse_mode: 'Markdown' # Experimental. Do not change unless you know what you are doing. Options: Markdown/MarkdownV2/HTML
 
 allow_private: false # Allow / disallow option for staff to chat privately
 direct_reply: false # Set this to true to just forward staff users to a user chat when allow_private
diff --git a/docker-compose.yml b/docker-compose.yml
index 8552a70..f5f075e 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,8 +1,7 @@
 version: '3'
 services:
   supportbot:
-    #build: .
-    image: "bostrot/telegram-support-bot:4.0.0"
+    build: .
     restart: unless-stopped
     volumes:
       - ${PWD}/config:/bot/config
diff --git a/src/files.ts b/src/files.ts
index 46d919f..a121778 100644
--- a/src/files.ts
+++ b/src/files.ts
@@ -63,7 +63,7 @@ function fileHandler(type: string, bot: TelegramAddon, ctx: Context) {
       );
     }
     // replying to non-ticket
-    if (userid === null || userid === undefined) {
+    if (userid == null) {
       return;
     }
   }
@@ -77,7 +77,12 @@ function fileHandler(type: string, bot: TelegramAddon, ctx: Context) {
     // }
     // if admin
     if (ctx.session.admin && userInfo === undefined) {
-      msgId = userid[1];
+      // null check here
+      if (userid != null) {
+        msgId = userid[1];
+      } else {
+        return;
+      }
     }
     db.getOpen(
         msgId,
diff --git a/src/middleware.ts b/src/middleware.ts
index faf5291..0a42ac8 100644
--- a/src/middleware.ts
+++ b/src/middleware.ts
@@ -4,17 +4,18 @@ import {Context} from './interfaces';
 
 // strict escape
 const strictEscape = function(str: string | any[]) {
-  let newStr = '';
-  const chars = ['[', ']', '(', ')', '_', '*', '~', '`'];
-  for (let i = 0; i < str.length; i++) {
-    // escape special characters
-    if (chars.includes(str[i])) {
-      newStr += '\\' + str[i];
-    } else {
-      newStr += str[i];
-    }
-  }
-  return newStr;
+  // let newStr = '';
+  // const chars = ['[', ']', '(', ')', '_', '*', '~', '`'];
+  // for (let i = 0; i < str.length; i++) {
+  //   // escape special characters
+  //   if (chars.includes(str[i])) {
+  //     newStr += '\\' + str[i];
+  //   } else {
+  //     newStr += str[i];
+  //   }
+  // }
+  // return newStr;
+  return str.toString();
 };
 
 // escape special characters
@@ -26,7 +27,7 @@ const escapeText = function(str: string | string[]) {
         .replace(/</g, '&lt;')
         .replace(/>/g, '&gt;')
         .replace(/"/g, '&quot;');
-  } else {
+  } else if (cache.config.parse_mode == 'MarkdownV2') {
     // '[', ']', '(', ')', are skipped as they are usally for urls
     // '_', '*', '~', '`', are used for actualy markdown
     const chars = ['>', '#', '+', '-', '=', '|', '{', '}', '.', '!'];
@@ -48,6 +49,7 @@ const escapeText = function(str: string | string[]) {
     }
     return newStr;
   }
+  return str.toString();
 };
 
 // handle messages to web socket
diff --git a/tsconfig.json b/tsconfig.json
index 88eb0f2..2dbb101 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -7,6 +7,7 @@
     "sourceMap": true,
     "moduleResolution": "node",
     "esModuleInterop": true,
+    "strictNullChecks" : false,
   },
   "include": [
     "./src/**/**/*"