diff --git a/src/DataBuilder.php b/src/DataBuilder.php
index 87fe0c96..43d5bd2e 100644
--- a/src/DataBuilder.php
+++ b/src/DataBuilder.php
@@ -499,7 +499,7 @@ public function makeFrames($exception, $includeContext)
 
     private function addCodeContextToFrame(Frame $frame, $filename, $line)
     {
-        if (!file_exists($filename)) {
+        if (null === $filename || !file_exists($filename)) {
             return;
         }