Fixed wrong null check

src/Host/Quickstart/Consent/ConsentService.cs

@@ -74,7 +74,7 @@ public async Task<ProcessConsentResult> ProcessConsent(ConsentInputModel model)
             {
                 // validate return url is still valid
                 var request = await _interaction.GetAuthorizationContextAsync(model.ReturnUrl);
-                if (result == null) return result;
+                if (request == null) return result;
 
                 // communicate outcome of consent back to identityserver
                 await _interaction.GrantConsentAsync(request, grantedConsent);