diff --git a/src/Runner/ErrorHandler.php b/src/Runner/ErrorHandler.php
index c50dda0b52..244be902fb 100644
--- a/src/Runner/ErrorHandler.php
+++ b/src/Runner/ErrorHandler.php
@@ -263,7 +263,7 @@ private function trigger(TestMethod $test, bool $filterTrigger): IssueTrigger
             $triggeredInFirstPartyCode = true;
         }
 
-        if (isset($trace[0]['file']) && (
+        if (isset($trace[1]['file']) && (
             $trace[1]['file'] === $test->file() ||
             $this->sourceFilter->includes($this->source, $trace[1]['file']))) {
             $triggerCalledFromFirstPartyCode = true;