From 9a380cd43e2ebff852155647e83b803b82a8a94b Mon Sep 17 00:00:00 2001
From: Martin Guillon <martin.guillon@akylas.fr>
Date: Wed, 30 Dec 2020 16:58:14 +0100
Subject: [PATCH] fix(core): prevent circular reference Frame <> Page (#9111)

---
 packages/core/ui/page/page-common.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/core/ui/page/page-common.ts b/packages/core/ui/page/page-common.ts
index 62c574842..a46095af0 100644
--- a/packages/core/ui/page/page-common.ts
+++ b/packages/core/ui/page/page-common.ts
@@ -6,7 +6,7 @@ import { Property, CssProperty } from '../core/properties';
 import { Style } from '../styling/style';
 import { Color } from '../../color';
 import { EventData } from '../../data/observable';
-import { Frame } from '../frame';
+import type { Frame } from '../frame';
 import { ActionBar } from '../action-bar';
 import { KeyframeAnimationInfo } from '../animation/keyframe-animation';
 import { profile } from '../../profiling';
@@ -94,7 +94,7 @@ export class PageBase extends ContentView {
 	get frame(): Frame {
 		const frame = this.parent;
 
-		return frame instanceof Frame ? frame : undefined;
+		return (frame && frame.constructor.name === 'Frame') ? frame as Frame : undefined;
 	}
 
 	private createNavigatedData(eventName: string, isBackNavigation: boolean): NavigatedData {