Cannot read property 'sendMessage' of undefined

[davebleekerpm]

Our bug tracking system is reporting "Cannot read property 'sendMessage' of undefined" coming from the faye library.
This does not happen everytime or for all users or on a specific action or message.

The full stack we have so far is:

Error: Cannot read property 'sendMessage' of undefined
at c._sendEnvelope in

Upon further investigating we found that the error was either that _transport or dispatched or undefined at the moment of this error. Creating a safeguard on our end would result in this being overwritten upon deploy, when it will do a npm install to fetch the latest faye package.

Is this a known issue, and is there any resolution for this?

Kind regards,
Dave Bleeker

[jcoglan]

It looks like you're referring to the Dispatcher._sendEnvelope() function. This has a guard the start to check that this._transport exists, and the call to this._transport.sendMessage() is synchronous with that guard. You'd need to find a way for this._transport to become unset between the guard passing and sendMessage() being called.