From 0c13f25bbb4d4674e76cd19b098900f698e7146e Mon Sep 17 00:00:00 2001
From: Liam DeBeasi <liamdebeasi@users.noreply.github.com>
Date: Fri, 8 May 2020 11:57:50 -0400
Subject: [PATCH] fix(header): do not error on collapsable header on devices
 that do not support IntersectionObserve (#21222)

---
 core/src/components/header/header.tsx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/core/src/components/header/header.tsx b/core/src/components/header/header.tsx
index bbdff3f2ce..29a5344785 100644
--- a/core/src/components/header/header.tsx
+++ b/core/src/components/header/header.tsx
@@ -87,6 +87,7 @@ export class Header implements ComponentInterface {
 
   private async setupCollapsibleHeader(contentEl: HTMLIonContentElement | null, pageEl: Element | null) {
     if (!contentEl || !pageEl) { console.error('ion-header requires a content to collapse, make sure there is an ion-content.'); return; }
+    if (typeof (IntersectionObserver as any) === 'undefined') { return; }
 
     this.scrollEl = await contentEl.getScrollElement();