From 8901f2f41bbf035efea9345d2f1fe9a9898fb532 Mon Sep 17 00:00:00 2001
From: CaptainNelis <nrnijhof@gmail.com>
Date: Fri, 14 Jul 2017 09:39:22 +0200
Subject: [PATCH] AOT build fix

Solves errors: "ERROR TypeError: Cannot read property 'isValid' of undefined" when building AOT.
---
 src/wizard.component.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/wizard.component.ts b/src/wizard.component.ts
index 8953f89a..5ee1754c 100644
--- a/src/wizard.component.ts
+++ b/src/wizard.component.ts
@@ -17,8 +17,8 @@ import { WizardStepComponent } from './wizard-step.component';
     </div>
     <div class="card-footer" [hidden]="isCompleted">
         <button type="button" class="btn btn-secondary float-left" (click)="previous()" [hidden]="!hasPrevStep || !activeStep.showPrev">Previous</button>
-        <button type="button" class="btn btn-secondary float-right" (click)="next()" [disabled]="!activeStep.isValid" [hidden]="!hasNextStep || !activeStep.showNext">Next</button>
-        <button type="button" class="btn btn-secondary float-right" (click)="complete()" [disabled]="!activeStep.isValid" [hidden]="hasNextStep">Done</button>
+        <button type="button" class="btn btn-secondary float-right" (click)="next()" [disabled]="!activeStep?.isValid" [hidden]="!hasNextStep || !activeStep.showNext">Next</button>
+        <button type="button" class="btn btn-secondary float-right" (click)="complete()" [disabled]="!activeStep?.isValid" [hidden]="hasNextStep">Done</button>
     </div>
   </div>`
   ,