diff --git a/src/Stratis.Features.Unity3dApi/Controllers/Unity3dController.cs b/src/Stratis.Features.Unity3dApi/Controllers/Unity3dController.cs
index e304a8f9a8..c13c4b078d 100644
--- a/src/Stratis.Features.Unity3dApi/Controllers/Unity3dController.cs
+++ b/src/Stratis.Features.Unity3dApi/Controllers/Unity3dController.cs
@@ -46,7 +46,7 @@ public class Unity3dController : Controller
         private readonly ILogger logger;
 
         public Unity3dController(ILoggerFactory loggerFactory, IAddressIndexer addressIndexer,
-            IBlockStore blockStore, IChainState chainState, Network network, ICoinView coinView, WalletController walletController, ChainIndexer chainIndexer, IStakeChain stakeChain)
+            IBlockStore blockStore, IChainState chainState, Network network, ICoinView coinView, WalletController walletController, ChainIndexer chainIndexer, IStakeChain stakeChain = null)
         {
             Guard.NotNull(loggerFactory, nameof(loggerFactory));
             this.logger = loggerFactory.CreateLogger(this.GetType().FullName);
@@ -57,7 +57,7 @@ public Unity3dController(ILoggerFactory loggerFactory, IAddressIndexer addressIn
             this.coinView = Guard.NotNull(coinView, nameof(coinView));
             this.walletController = Guard.NotNull(walletController, nameof(walletController));
             this.chainIndexer = Guard.NotNull(chainIndexer, nameof(chainIndexer));
-            this.stakeChain = Guard.NotNull(stakeChain, nameof(stakeChain));
+            this.stakeChain = stakeChain;
         }
 
         /// <summary>