diff --git a/testing/talos/talos/tests/devtools/addon/content/damp.js b/testing/talos/talos/tests/devtools/addon/content/damp.js
index 1645922ba1a0..412eaced01c7 100644
--- a/testing/talos/talos/tests/devtools/addon/content/damp.js
+++ b/testing/talos/talos/tests/devtools/addon/content/damp.js
@@ -390,8 +390,9 @@ Damp.prototype = {
   },
 
   exception(e) {
-    this.error(e);
-    dump(e.stack + "\n");
+    const str =
+      "Exception: " + (e?.message || e) + "\n" + (e?.stack || "No stack");
+    this.error(str);
   },
 
   // Waits for any pending operations that may execute on Firefox startup and that