diff --git a/src/GWallet.Backend/Ether/EtherExceptions.fs b/src/GWallet.Backend/Ether/EtherExceptions.fs
index a08d73033..5fd364177 100644
--- a/src/GWallet.Backend/Ether/EtherExceptions.fs
+++ b/src/GWallet.Backend/Ether/EtherExceptions.fs
@@ -95,3 +95,8 @@ type UnhandledWebException =
         }
     new (info: SerializationInfo, context: StreamingContext) =
         { inherit Exception (info, context) }
+
+/// Exception indicating that response JSON contains null value where it should not.
+/// E.g. {"jsonrpc":"2.0","id":1,"result":null}
+type WeirdNullResponseException(message: string) =
+    inherit CommunicationUnsuccessfulException(message)
diff --git a/src/GWallet.Backend/Ether/EtherServer.fs b/src/GWallet.Backend/Ether/EtherServer.fs
index 3e86bbb9f..bfb5a2611 100644
--- a/src/GWallet.Backend/Ether/EtherServer.fs
+++ b/src/GWallet.Backend/Ether/EtherServer.fs
@@ -561,7 +561,7 @@ module Server =
                                 return! Async.AwaitTask task
                             }
                     if Object.ReferenceEquals(balance, null) then
-                        failwith "Weird null response from balance job"
+                        raise <| WeirdNullResponseException "Weird null response from balance job"
                     return UnitConversion.Convert.FromWei(balance.Value, UnitConversion.EthUnit.Ether)
                 }
                 GetRandomizedFuncs currency web3Func
diff --git a/src/GWallet.Backend/ServerManager.fs b/src/GWallet.Backend/ServerManager.fs
index 958ff3d6e..6e423aa1a 100644
--- a/src/GWallet.Backend/ServerManager.fs
+++ b/src/GWallet.Backend/ServerManager.fs
@@ -128,6 +128,8 @@ module ServerManager =
                 let web3Func (web3: Ether.SomeWeb3): Async<decimal> =
                     async {
                         let! balance = Async.AwaitTask (web3.Eth.GetBalance.SendRequestAsync ETH_GENESISBLOCK_ADDRESS)
+                        if isNull balance then
+                            raise <| Ether.WeirdNullResponseException "Weird null response from balance job"
                         return balance.Value |> decimal
                     }