diff --git a/lib/fuzzer/main.js b/lib/fuzzer/main.js
index 773cdfe902..ce02276f98 100644
--- a/lib/fuzzer/main.js
+++ b/lib/fuzzer/main.js
@@ -214,7 +214,7 @@
     // Empirically, Firefox needs this requestAnimationFrame in order for the scrollIntoView to work.
     requestAnimationFrame(function() {
       const slDom = document.getElementById("l" + sourceLocationIndex);
-      slDom.scrollIntoView({
+      if (slDom != null) slDom.scrollIntoView({
         behavior: "smooth",
         block: "center",
       });