diff --git a/src/_util/dom.ts b/src/_util/dom.ts
index a8b846b44..65865a9b8 100644
--- a/src/_util/dom.ts
+++ b/src/_util/dom.ts
@@ -103,7 +103,7 @@ export const getScrollContainer = (container: ScrollContainer = 'body'): ScrollC
   if (typeof container === 'function') {
     return container();
   }
-  return container;
+  return container || window;
 };
 
 /**
diff --git a/src/anchor/Anchor.tsx b/src/anchor/Anchor.tsx
index 1157625af..b8a24f241 100644
--- a/src/anchor/Anchor.tsx
+++ b/src/anchor/Anchor.tsx
@@ -147,9 +147,9 @@ const Anchor = forwardRefWithStatics(
       const { scrollContainer } = intervalRef.current;
 
       handleScroll();
-      scrollContainer.addEventListener('scroll', handleScroll);
+      scrollContainer?.addEventListener('scroll', handleScroll);
       return () => {
-        scrollContainer.removeEventListener('scroll', handleScroll);
+        scrollContainer?.removeEventListener('scroll', handleScroll);
       };
     }, [container, handleScroll]);