diff --git a/app/scripts/modules/core/src/pipeline/config/stages/webhook/webhookStage.ts b/app/scripts/modules/core/src/pipeline/config/stages/webhook/webhookStage.ts
index 1df784ee680..558df5fbb84 100644
--- a/app/scripts/modules/core/src/pipeline/config/stages/webhook/webhookStage.ts
+++ b/app/scripts/modules/core/src/pipeline/config/stages/webhook/webhookStage.ts
@@ -45,7 +45,7 @@ export class WebhookStage implements IController {
   public methods: string[];
   public preconfiguredProperties: string[];
   public noUserConfigurableFields: boolean;
-  public parameters: IWebhookParameter[];
+  public parameters: IWebhookParameter[] = [];
 
   constructor(public stage: any,
               private jsonUtilityService: JsonUtilityService,