diff --git a/testing/test_runner.py b/testing/test_runner.py
index 49adc04fe..cbb9ee1c7 100644
--- a/testing/test_runner.py
+++ b/testing/test_runner.py
@@ -473,6 +473,7 @@ class TestSessionReports:
         assert not rep.skipped
         assert rep.passed
         locinfo = rep.location
+        assert locinfo is not None
         assert locinfo[0] == col.path.name
         assert not locinfo[1]
         assert locinfo[2] == col.path.name