How to stop snap execution

I have a pipeline which along the way checks for a presence of a particular value. If there is no value it should exit without errors but not execute the the rest of the pipelines. How do I achive that?
For example:

1. MySQL Snap reads a value from somewhere → 2. MySQL Snap uses the value and writes it to another table
   Imagine that the first snap’s read returns null i.e. there is not value. How can I check that and make the pipeline stop without an error and not execute the second snap?
   I tried with Filter and Router but that did not work.
   I tried with Router and Exit but the Exit throws an error and does not stop the second snap from executing either.
   Thanks!