Sql Backplane: Nullable object must have a value in SqlReceiver.Receive

[ElanHasson]

I see this in my event log and it prevents my app from running as it is executed in Startup class. This is only happening outside of my dev environment (as always, right?). I'm using latest nuget packages. Any help is appreciated.

I have configured tracing as defined in https://github.com/SignalR/SignalR/blob/master/samples/Microsoft.AspNet.SignalR.Samples/Web.config

Only bus.log is created and contains only this:

SignalR.SqlMessageBus Information: 0 : Start installing SignalR SQL objects SignalR.SqlMessageBus Information: 0 : SignalR SQL objects installed SignalR.ScaleoutMessageBus Information: 0 : Stream(0) - Changed state from Initial to Open

`Exception: System.InvalidOperationException

Message: Nullable object must have a value.

StackTrace: at Microsoft.AspNet.SignalR.SqlServer.SqlReceiver.Receive(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
at System.Threading.ThreadPoolWorkQueue.Dispatch()`

Also from Event log:
`Fault bucket , type 0
Event Name: CLR20r3
Response: Not available
Cab Id: 0

Problem signature:
P1: w3wp.exe
P2: 8.5.9600.16384
P3: 5215df96
P4: Microsoft.AspNet.SignalR.SqlServer
P5: 2.1.30912.170
P6: 5412b3c9
P7: af
P8: bb
P9: System.InvalidOperationException
P10:
[...removed paths of dumps for brevity..Dump available if someone wants it...81 MB.]

[ElanHasson]

The issue was due to me using Web Deploy and enabling the DB migrations from EF on deploy.

Deleting the database and unchecking the option made it work properly.