diff --git a/XenAdmin/Wizards/PatchingWizard/PatchingWizard_PrecheckPage.cs b/XenAdmin/Wizards/PatchingWizard/PatchingWizard_PrecheckPage.cs
index e9cc8f23d5..d77bb279c3 100644
--- a/XenAdmin/Wizards/PatchingWizard/PatchingWizard_PrecheckPage.cs
+++ b/XenAdmin/Wizards/PatchingWizard/PatchingWizard_PrecheckPage.cs
@@ -463,7 +463,7 @@ protected virtual List<CheckGroup> GenerateCommonChecks(List<Host> applicableSer
                     groups.Add(new CheckGroup(Messages.CHECKING_CANEVACUATE_STATUS, evacuateChecks));
             }
 
-            var newServerversion = highestNewVersion ?? UpdateAlert.NewServerVersion;
+            var newServerversion = highestNewVersion ?? UpdateAlert?.NewServerVersion;
 
             if (newServerversion != null)
             {