CODEWITHSUNDEEP
javascriptnode.jsdiscorddiscord.js
T1ranexDev
T1ranexDev

Reputation: 57

TypeError: Cannot read properties of undefined (reading 'catch')

I am trying to get channel with an id or mention, the code itself works but when user gives wrong ID it says: TypeError: Cannot read properties of undefined (reading 'catch')

Can anyone help me?

I tried this:

message.guild.channels.cache.find(channel => channel.id == args[0]).catch(err => {});

And this:

message.guild.channels.cache.get(args[0]).catch(err => {});

These both things give me error.

Heres the code:

if (args[0].startsWith("<#")) channel = message.mentions.channels.first();
        else channel = message.guild.channels.cache.get(args[0]).catch(err => {
    //do stuff
    })

Upvotes: 1

Views: 20682

Answers (2)

MagicKriss
MagicKriss

Reputation: 178

The error TypeError: Cannot read properties of undefined (reading 'catch') means that you are calling catch on undefined.

Basically, it's undefined.catch(). Assuming you are working with promises, this can happen when a method that's being called is not present in the object. e.g


const myObj = {
  fun1: async () => {
    const res = await callingExternalFun();
    if (res.error) {
      throw new Error('my error');
    }
  },
};

myObj.fun1().catch((e) => {console.log(e.message)}); // my error
myObj.fun2().catch((e) => {console.log(e.message)}); // TypeError: Cannot read properties of undefined (reading 'catch')

Here, myObj has async function fun1 that might return an error. So the .catch here comes from Promise.prototype.catch()

However, myObj doesn't have a function fun2, it's undefiend and catch will return this error.

Upvotes: 0

T1ranexDev
T1ranexDev

Reputation: 57

Okay so i found out the answer with help of @JeremyThille: `When the id is wrong it tries to null.catch()

I removed catch from the code and added

if(!channel) //do stuff

Thanks @JeremyThille

Upvotes: 2

Related Questions