diff --git a/.changeset/calm-oranges-sin.md b/.changeset/calm-oranges-sin.md
new file mode 100644
index 0000000000..a1449698e4
--- /dev/null
+++ b/.changeset/calm-oranges-sin.md
@@ -0,0 +1,5 @@
+---
+'rrweb': patch
+---
+
+fix: Fix checking for `patchTarget` in `initAdoptedStyleSheetObserver`
diff --git a/packages/rrweb/src/record/observer.ts b/packages/rrweb/src/record/observer.ts
index 428cce1a4e..416b7c86c6 100644
--- a/packages/rrweb/src/record/observer.ts
+++ b/packages/rrweb/src/record/observer.ts
@@ -900,10 +900,12 @@ export function initAdoptedStyleSheetObserver(
     host.nodeName === '#document'
       ? (host as Document).defaultView?.Document
       : host.ownerDocument?.defaultView?.ShadowRoot;
-  const originalPropertyDescriptor = Object.getOwnPropertyDescriptor(
-    patchTarget?.prototype,
-    'adoptedStyleSheets',
-  );
+  const originalPropertyDescriptor = patchTarget?.prototype
+    ? Object.getOwnPropertyDescriptor(
+        patchTarget?.prototype,
+        'adoptedStyleSheets',
+      )
+    : undefined;
   if (
     hostId === null ||
     hostId === -1 ||