diff --git a/lib/user/privilege/IPrivilegeManager.js b/lib/user/privilege/IPrivilegeManager.js
index a1cb8713..7780bf36 100644
--- a/lib/user/privilege/IPrivilegeManager.js
+++ b/lib/user/privilege/IPrivilegeManager.js
@@ -17,6 +17,12 @@ function requirePrivilege(privilege, arg, resource, callback) {
 }
 exports.requirePrivilege = requirePrivilege;
 function hasNoWriteLock(arg, resource, callback) {
-    resource.getLocks(function (e, locks) { return callback(e, locks ? locks.filter(function (l) { return l.user !== arg.user && l.lockKind.type.isSame(LockType_1.LockType.Write); }).length === 0 : false); });
+    resource.getLocks(function (e, locks) {
+        var hasNoLock = locks ? locks.filter(function (l) { return l.user !== arg.user && l.lockKind.type.isSame(LockType_1.LockType.Write); }).length === 0 : false;
+        if (!hasNoLock || !resource.parent)
+            callback(e, hasNoLock);
+        else
+            hasNoWriteLock(arg, resource.parent, callback);
+    });
 }
 exports.hasNoWriteLock = hasNoWriteLock;
diff --git a/src/user/privilege/IPrivilegeManager.ts b/src/user/privilege/IPrivilegeManager.ts
index b53494a7..38a8e4bd 100644
--- a/src/user/privilege/IPrivilegeManager.ts
+++ b/src/user/privilege/IPrivilegeManager.ts
@@ -83,5 +83,11 @@ export interface IPrivilegeManager
 
 export function hasNoWriteLock(arg : MethodCallArgs, resource : IResource, callback : PrivilegeManagerCallback)
 {
-    resource.getLocks((e, locks) => callback(e, locks ? locks.filter((l) => l.user !== arg.user && l.lockKind.type.isSame(LockType.Write)).length === 0 : false));
+    resource.getLocks((e, locks) => {
+        const hasNoLock = locks ? locks.filter((l) => l.user !== arg.user && l.lockKind.type.isSame(LockType.Write)).length === 0 : false;
+        if(!hasNoLock || !resource.parent)
+            callback(e, hasNoLock);
+        else
+            hasNoWriteLock(arg, resource.parent, callback);
+    });
 }