Attempt to fix crash when bot is added/removed from group

commands.rb

@@ -1,7 +1,8 @@
 def validate_incoming_data(message)
     message = message.message if message.is_a? Telegram::Bot::Types::CallbackQuery
     return "Received message is not from a valid source! Type: \"#{message.chat.type}\". Ignoring." if ! @allowed_sources.include?(message.chat.type)
-    puts message.chat.type
+    return "Unauthorized user sent message. User ID: #{message.from.id} Source ID: #{message.chat.id}." if ! @conf['auth_chat'].include?(message.chat.id.to_s)
+    #puts message.chat.type
     return true
 end