add useful check for user to _processWithdraw

Signed-off-by: T-Hax <>

contracts/instances/ERC20TornadoCloneable.sol

@@ -161,10 +161,17 @@ contract ERC20TornadoCloneable is ERC20Tornado {
     uint256 _fee,
     uint256 _refund
   ) internal override {
+    // This is the part which we don't check if infra is down
     if (router != address(0)) {
       require(msg.sender == router, "if infrastructure not dead, router must be caller");
     }
 
+    // This check should make sure that a user doesn't doom his refund by chance
+    if (_relayer == address(0)) {
+      require(_fee == 0 && _refund == 0, "no fees and refunds if no relayer");
+    }
+
+    // Call the regular super version of the function
     super._processWithdraw(_recipient, _relayer, _fee, _refund);
   }
 }