diff --git a/packages/rrweb/src/record/observer.ts b/packages/rrweb/src/record/observer.ts
index cfc17a7e79..324342e1db 100644
--- a/packages/rrweb/src/record/observer.ts
+++ b/packages/rrweb/src/record/observer.ts
@@ -538,6 +538,13 @@ function initStyleSheetObserver(
   { styleSheetRuleCb, mirror, stylesheetManager }: observerParam,
   { win }: { win: IWindow },
 ): listenerHandler {
+  if (!win.CSSStyleSheet || !win.CSSStyleSheet.prototype) {
+    // If, for whatever reason, CSSStyleSheet is not available, we skip the observation of stylesheets.
+    return () => {
+      // Do nothing
+    };
+  }
+
   // eslint-disable-next-line @typescript-eslint/unbound-method
   const insertRule = win.CSSStyleSheet.prototype.insertRule;
   win.CSSStyleSheet.prototype.insertRule = function (