How to deal with an uncaught exception error in Meteor?

How do I listen to an uncaught exception error in meteor?

The errors are of course specific to the cause, so please can a provide a pseudo style code/explanation that states the concept of handling this error.

An example use cases:

A user clicks 'logout' but there is an uncaught exception and the user does not get logged out and so the connection to the server remains open.