diff --git a/contracts/BridgingManager.sol b/contracts/BridgingManager.sol
index 224c331f..bb844aff 100644
--- a/contracts/BridgingManager.sol
+++ b/contracts/BridgingManager.sol
@@ -38,6 +38,9 @@ contract BridgingManager is AccessControl {
     /// @dev This method might be called only once
     /// @param admin_ Address of the account to grant the DEFAULT_ADMIN_ROLE
     function _initializeBridgingManager(address admin_) internal {
+        if (admin_ == address(0)) {
+            revert ErrorZeroAddressAdmin();
+        }
         State storage s = _loadState();
         if (s.isInitialized) {
             revert ErrorAlreadyInitialized();
@@ -135,6 +138,7 @@ contract BridgingManager is AccessControl {
     event WithdrawalsDisabled(address indexed disabler);
     event Initialized(address indexed admin);
 
+    error ErrorZeroAddressAdmin();
     error ErrorDepositsEnabled();
     error ErrorDepositsDisabled();
     error ErrorWithdrawalsEnabled();
diff --git a/contracts/token/ERC20RebasableBridged.sol b/contracts/token/ERC20RebasableBridged.sol
index 69f9ee2f..f2adfe12 100644
--- a/contracts/token/ERC20RebasableBridged.sol
+++ b/contracts/token/ERC20RebasableBridged.sol
@@ -362,7 +362,7 @@ contract ERC20RebasableBridged is IERC20, IERC20Wrapper, IBridgeWrapper, ERC20Me
         _setERC20MetadataSymbol(symbol_);
     }
 
-   function _wrap(address from_, address to_, uint256 sharesAmount_) internal returns (uint256) {
+    function _wrap(address from_, address to_, uint256 sharesAmount_) internal returns (uint256) {
         if (sharesAmount_ == 0) revert ErrorZeroSharesWrap();
         TOKEN_TO_WRAP_FROM.safeTransferFrom(from_, address(this), sharesAmount_);
         _mintShares(to_, sharesAmount_);
diff --git a/test/optimism/L1LidoTokensBridge.unit.test.ts b/test/optimism/L1LidoTokensBridge.unit.test.ts
index 2b5aac66..4ddf4304 100644
--- a/test/optimism/L1LidoTokensBridge.unit.test.ts
+++ b/test/optimism/L1LidoTokensBridge.unit.test.ts
@@ -171,6 +171,37 @@ unit("Optimism :: L1LidoTokensBridge", ctxFactory)
     );
   })
 
+  .test("initialize() :: revert when admin is zero", async (ctx) => {
+    const { deployer, l2TokenBridgeEOA, zero } = ctx.accounts;
+    const {
+      totalPooledEther,
+      totalShares,
+      genesisTime,
+      secondsPerSlot,
+      lastProcessingRefSlot
+    } = ctx.constants;
+
+    const { l1TokenBridgeImpl } = await getL1LidoTokensBridgeImpl(
+      totalPooledEther,
+      totalShares,
+      genesisTime,
+      secondsPerSlot,
+      lastProcessingRefSlot,
+      deployer,
+      l2TokenBridgeEOA.address
+    );
+
+    await assert.revertsWith(new OssifiableProxy__factory(
+      deployer
+    ).deploy(
+      l1TokenBridgeImpl.address,
+      deployer.address,
+      l1TokenBridgeImpl.interface.encodeFunctionData("initialize", [
+        zero.address
+      ])
+    ), "ErrorZeroAddressAdmin()");
+  })
+
   .test("initialize() :: don't allow to initialize twice", async (ctx) => {
     const { deployer, l2TokenBridgeEOA } = ctx.accounts;
     const {
diff --git a/test/optimism/L2ERC20ExtendedTokensBridge.unit.test.ts b/test/optimism/L2ERC20ExtendedTokensBridge.unit.test.ts
index a00f1130..c857a22e 100644
--- a/test/optimism/L2ERC20ExtendedTokensBridge.unit.test.ts
+++ b/test/optimism/L2ERC20ExtendedTokensBridge.unit.test.ts
@@ -161,6 +161,21 @@ unit("Optimism:: L2ERC20ExtendedTokensBridge", ctxFactory)
     );
   })
 
+  .test("initialize() :: revert when admin is zero", async (ctx) => {
+    const { deployer, l1TokenBridgeEOA, zero } = ctx.accounts;
+    const l2TokenBridgeImpl = await getL2TokenBridgeImpl(deployer, l1TokenBridgeEOA.address);
+
+    await assert.revertsWith(new OssifiableProxy__factory(
+      deployer
+    ).deploy(
+      l2TokenBridgeImpl.address,
+      deployer.address,
+      l2TokenBridgeImpl.interface.encodeFunctionData("initialize", [
+        zero.address
+      ])
+    ), "ErrorZeroAddressAdmin()");
+  })
+
   .test("finalizeUpgrade_v2() :: bridging manager uninitialized", async (ctx) => {
     const { deployer, l1TokenBridgeEOA } = ctx.accounts;