diff --git a/packages/mui-material/src/Unstable_TrapFocus/FocusTrap.tsx b/packages/mui-material/src/Unstable_TrapFocus/FocusTrap.tsx
index 70790d64e317af..1678182dcd84f1 100644
--- a/packages/mui-material/src/Unstable_TrapFocus/FocusTrap.tsx
+++ b/packages/mui-material/src/Unstable_TrapFocus/FocusTrap.tsx
@@ -211,7 +211,6 @@ function FocusTrap(props: FocusTrapProps): React.JSX.Element {
     }
 
     const doc = ownerDocument(rootRef.current);
-    const activeElement = getActiveElement(doc);
 
     const loopFocus = (nativeEvent: KeyboardEvent) => {
       lastKeydown.current = nativeEvent;
@@ -220,6 +219,8 @@ function FocusTrap(props: FocusTrapProps): React.JSX.Element {
         return;
       }
 
+      const activeElement = getActiveElement(doc);
+
       // Make sure the next tab starts from the right place.
       // activeElement refers to the origin.
       if (activeElement === rootRef.current && nativeEvent.shiftKey) {