Crashing collection runner when we send GET method to a POST service

i have a POST service which is working with collection runner for POST requests and complete the iterations planned. i wanted to add a negative clause to send a GET request to the same POST service. i duplicated a request and changed the Method to GET. ran collection runner with same data and iterations and when the GET request comes into picture the execution stops even if i have multiple valid requests in queue for execution. is there any solution to continue the execution?