fix(next): safely checks user within useEffect (#8524)

Author: PatrikKozak

packages/next/src/views/Edit/Default/index.tsx

@@ -319,7 +319,7 @@ export const DefaultEditView: React.FC = () => {
       // Unlock the document only if we're actually navigating away from the document
       if (documentId && documentIsLocked && !isStayingWithinDocument) {
         // Check if this user is still the current editor
-        if (documentLockStateRef.current?.user?.id === user.id) {
+        if (documentLockStateRef.current?.user?.id === user?.id) {
           void unlockDocument(id, collectionSlug ?? globalSlug)
           setDocumentIsLocked(false)
           setCurrentEditor(null)
@@ -333,7 +333,7 @@ export const DefaultEditView: React.FC = () => {
     globalSlug,
     id,
     unlockDocument,
-    user.id,
+    user,
     setCurrentEditor,
     isLockingEnabled,
     documentIsLocked,

packages/next/src/views/LivePreview/index.client.tsx

@@ -258,7 +258,7 @@ const PreviewView: React.FC<Props> = ({
       // Unlock the document only if we're actually navigating away from the document
       if (documentId && documentIsLocked && !isStayingWithinDocument) {
         // Check if this user is still the current editor
-        if (documentLockStateRef.current?.user?.id === user.id) {
+        if (documentLockStateRef.current?.user?.id === user?.id) {
           void unlockDocument(id, collectionSlug ?? globalSlug)
           setDocumentIsLocked(false)
           setCurrentEditor(null)
@@ -272,7 +272,7 @@ const PreviewView: React.FC<Props> = ({
     globalSlug,
     id,
     unlockDocument,
-    user.id,
+    user,
     setCurrentEditor,
     isLockingEnabled,
     documentIsLocked,