diff --git a/reactos/ntoskrnl/ex/resource.c b/reactos/ntoskrnl/ex/resource.c
index 2496776a89d..be1836d5dcf 100644
--- a/reactos/ntoskrnl/ex/resource.c
+++ b/reactos/ntoskrnl/ex/resource.c
@@ -361,7 +361,7 @@ ExpExpandResourceOwnerTable(IN PERESOURCE Resource,
     else
     {
         /* Copy the table */
-        RtlCopyMemory(Table, Owner, OldSize * sizeof(OWNER_ENTRY));
+        if (Owner) RtlCopyMemory(Table, Owner, OldSize * sizeof(OWNER_ENTRY));
 
         /* Acquire dispatcher lock to prevent thread boosting */
         OldIrql = KiAcquireDispatcherLock();