diff --git a/components/script/dom/servointernals.rs b/components/script/dom/servointernals.rs
index 52042275de0..b104238a8af 100644
--- a/components/script/dom/servointernals.rs
+++ b/components/script/dom/servointernals.rs
@@ -59,7 +59,8 @@ impl ServoInternalsMethods<crate::DomTypeHolder> for ServoInternals {
 
 impl RoutedPromiseListener<MemoryReportResult> for ServoInternals {
     fn handle_response(&self, response: MemoryReportResult, promise: &Rc<Promise>, can_gc: CanGc) {
-        let stringified = serde_json::to_string(&response.results).unwrap();
+        let stringified = serde_json::to_string(&response.results)
+            .unwrap_or_else(|_| "{ error: \"failed to create memory report\"}".to_owned());
         promise.resolve_native(&stringified, can_gc);
     }
 }