How to fix TypeError: Cannot read property 'chat' of null with telegram bot?

Question

Node.js

I am writing a telegram bot on node js and I started typing cron, but for some reason I get this error

TypeError: Cannot read property 'chat' of null
at CronJob. (c:\Users\User\Desktop\ris-bot\bot.js:99:24)
at CronJob.fireOnTick (c:\Users\User\Desktop\ris-bot\node_modules\cron\lib\cron.js: 600:23)
at Timeout.callbackWrapper [as _onTimeout] (c:\Users\User\Desktop\ris-bot\node_modules\cron\lib\cron.js:667:10)
at listOnTimeout (internal/timers.js:549 :17)
at processTimers (internal/timers.js:492:7)

Answer 1

In all such situations, the treatment is the same: go through the chain of objects and properties, look through the debugger, what lies in the variables, in the properties and find out where you are losing value. Most likely, when receiving a response from the server and parsing json, you made a mistake in the chain of properties of the received object.
More recently, optional chaining has been added to the language standard to handle such cases, and nullish coalescing can also help. You can read it on MDN or an old article on Habré , some of it has already been included in the ES2020 standard