When there is an error executing a component, the execution continues in the Error Handler flow. If you're not specifying anything in your Error Handler flow, then the call is dropped. If you want to handle an error and continue the execution no matter about it, then you should put your possibly failing component inside a User Defined component, and then handle any possible error inside the Error Handler flow of that User Defined component. Then the execution will continue in the main flow of the parent call flow.