From cae959359b00dc8d6aa8bc20074818ae70f696a7 Mon Sep 17 00:00:00 2001
From: Riad Benguella <benguella@gmail.com>
Date: Mon, 6 Nov 2017 18:20:24 +0100
Subject: [PATCH] Metaboxes: unbind form events on unmount

---
 editor/components/meta-boxes/meta-boxes-area/index.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/editor/components/meta-boxes/meta-boxes-area/index.js b/editor/components/meta-boxes/meta-boxes-area/index.js
index efcae3d9866140..cbb058fd2fb04c 100644
--- a/editor/components/meta-boxes/meta-boxes-area/index.js
+++ b/editor/components/meta-boxes/meta-boxes-area/index.js
@@ -42,6 +42,14 @@ class MetaBoxesArea extends Component {
 
 	componentWillUnmout() {
 		this.mounted = false;
+		this.unbindFormEvents();
+	}
+
+	unbindFormEvents() {
+		if ( this.form ) {
+			this.form.removeEventListener( 'change', this.checkState );
+			this.form.removeEventListener( 'input', this.checkState );
+		}
 	}
 
 	componentWillReceiveProps( nextProps ) {
@@ -57,6 +65,7 @@ class MetaBoxesArea extends Component {
 			};
 			const request = window.fetch( addQueryArgs( window._wpMetaBoxUrl, { meta_box: location } ), fetchOptions );
 			this.onMetaboxResponse( request, false );
+			this.unbindFormEvents();
 		}
 	}