Has anyone seen this exception before? I was running all my PlayMode tests when they ended early with this error. NullReferenceException: Object reference not set to an instance of an object UnityEngine.TestTools.TestRunner.PlaymodeTestsController+<TestRunnerCoroutine>d__15.MoveNext () (at Library/PackageCachefirstname.lastname@example.org/UnityEngine.TestRunner/TestRunner/PlaymodeTestsController.cs:74) All tests pass individually or in their suites. But running as a large group by selecting all and running causes this error. It keeps breaking after the same number of tests so the error is consistent. I tried deleting the Library folder but no luck. It's never happened before. I did make a change to one of my tests but: The method signature is the same. Iow, it's not the UnityTest with void return versus Test with IEnumerator return error The change only had to do with the removal of an Assert so I'm not sure what caused it. This test runs to completion sucessfully and additional test suites are ran afterwards. But it does have something to do with my code changes apparently, because the exception does not occur on my develop branch, only the one with my changes.