diff --git a/README.md b/README.md
index 91d6ad9..557c571 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,15 @@
 # Vk to Telegram bot
 
 ### Configuring
+
 Copy `config.example.yml` to `config.yml` and set it up.
 
 #### Running
-`yarn && yarn build && node ./dist/index.js`
+
+Setup environment: `yarn environment`, then run the application: `yarn && yarn build && node ./dist/index.js`
 
 #### Custom arguments
+
 ```bash
 node ./dist/index.js \
     --config ./config-dev.yml
diff --git a/package.json b/package.json
index 8bc631e..bf14297 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,7 @@
   "main": "index.js",
   "license": "MIT",
   "scripts": {
+    "environment": "docker-compose -f ./docker/docker-compose.yml up db -d",
     "start": "node ./dist/index.js",
     "dev": "NODE_ENV=dev node -r ts-node/register ./src/index.ts --config=./config.yml",
     "build": "rm -rf ./dist && tsc && copyfiles -f ./config*.yml ./dist && copyfiles ./templates/*.md ./dist",
diff --git a/src/config/index.ts b/src/config/index.ts
index dc3c6c0..c483e43 100644
--- a/src/config/index.ts
+++ b/src/config/index.ts
@@ -30,8 +30,11 @@ export default function prepareConfig() {
       const key = JSON.parse(
         fs.readFileSync(config.calendar?.keyFile).toString()
       ) as CalendarKeyFile;
-      calendarKeyValidator.validateSync(key);
-      config.calendarKey = key;
+
+      if (key) {
+        calendarKeyValidator.validateSync(key);
+        config.calendarKey = key;
+      }
     } catch (error) {
       console.warn("tried to parse calendar key, got error", error);
     }