diff --git a/reactos/ntoskrnl/se/semgr.c b/reactos/ntoskrnl/se/semgr.c
index 9f3f82740fc..68e93e4da91 100644
--- a/reactos/ntoskrnl/se/semgr.c
+++ b/reactos/ntoskrnl/se/semgr.c
@@ -971,7 +971,7 @@ SeAccessCheck(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
       return FALSE;
    }
 
-  if (SepSidInToken(Token, Sid))
+  if (Sid && SepSidInToken(Token, Sid))
     {
       CurrentAccess |= (READ_CONTROL | WRITE_DAC);
       if (DesiredAccess == CurrentAccess)