Crash when selecting entity and not selecting ticket type

Entity screens are set to as ‘Ask Ticket Type’

With selecting entity:

2020-12-01_03;45_1606815907_%pn1166×643 325 KB

Without selecting entity:

2020-12-01_03;49_1606816198_%pn1166×643 322 KB

Exception:

Top-level Exception
Type:        System.Reflection.TargetInvocationException
Message:     Exception has been thrown by the target of an invocation.
Source:      mscorlib
Stack Trace: at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   at System.Delegate.DynamicInvokeImpl(Object[] args)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

Inner Exception 1
Type:        System.NullReferenceException
Message:     Object reference not set to an instance of an object.
Source:      Samba.Presentation.ClientLibrary
Stack Trace: at Samba.Presentation.ClientLibrary.Modules.PosModule.PosViewModel.OnEntitySelectedForTicket(EventParameters`1 eventParameters) in C:\Users\Vehbi\Documents\Source\Repos\sambapos-v5-pro\Samba.Presentation.ClientLibrary\Modules\PosModule\PosViewModel.cs:line 298
   at Microsoft.Practices.Prism.Events.EventSubscription`1.InvokeAction(Action`1 action, TPayload argument)
   at Microsoft.Practices.Prism.Events.EventSubscription`1.<>c__DisplayClass2.<GetExecutionStrategy>b__0(Object[] arguments)
   at Microsoft.Practices.Prism.Events.EventBase.InternalPublish(Object[] arguments)
   at Microsoft.Practices.Prism.Events.CompositePresentationEvent`1.Publish(TPayload payload)
   at Samba.Presentation.Services.Common.ExtensionMethods.Publish[TEventsubject](TEventsubject eventArgs, String eventTopic, Action expectedAction)

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