Unexpected behavior when TestReport or TestResults is not available in a specific build of a Jenkins job

Here's what i am trying to do:

I want to print the passCount, failCount and skipCount for the last 5 builds for a specific job. There are some jobs in our system that has failed even before the test starts hence the testReport and results are not available. I would be able to do a null check if they are not available in the build.

Here' what i am doing:

If(specificBuild.details().getTestResult() != null){
//capture test pass, fails and skip count
}

For some reason this does not work as expected. Please fix. Also, please let me know if i am missing anything. Thanks in advance.