diff --git a/ethereum/contracts/bridge/BridgeSetters.sol b/ethereum/contracts/bridge/BridgeSetters.sol
index 8f5d25dda..2a73d5ed0 100644
--- a/ethereum/contracts/bridge/BridgeSetters.sol
+++ b/ethereum/contracts/bridge/BridgeSetters.sol
@@ -35,6 +35,7 @@ contract BridgeSetters is BridgeState {
     }
 
     function setTokenImplementation(address impl) internal {
+        require(impl != address(0), "invalid implementation address");
         _state.tokenImplementation = impl;
     }
 
diff --git a/ethereum/contracts/nft/NFTBridgeSetters.sol b/ethereum/contracts/nft/NFTBridgeSetters.sol
index addda57d1..b5048dbb2 100644
--- a/ethereum/contracts/nft/NFTBridgeSetters.sol
+++ b/ethereum/contracts/nft/NFTBridgeSetters.sol
@@ -35,6 +35,7 @@ contract NFTBridgeSetters is NFTBridgeState {
     }
 
     function setTokenImplementation(address impl) internal {
+        require(impl != address(0), "invalid implementation address");
         _state.tokenImplementation = impl;
     }