The onErrorResumeNext operator helps you subscribe to a different producer in case any error occurs.

Here is an example:

    fun main(args: Array<String>) { 
      Observable.just(1,2,3,4,5) 
        .map { it/(3-it) } 
        .onErrorResumeNext(Observable.range(10,5))//(1) 
        .subscribe { 
           println("Received $it") 
        } 
   }

The output is as follows:

This operator is especially useful when you want to subscribe to another source producer in case any error occurs.