From 715e9645ae69e1cb11dacb79995aba6445467e08 Mon Sep 17 00:00:00 2001
From: Murad R <rohozhnikoff@users.noreply.github.com>
Date: Mon, 13 Nov 2017 12:16:50 +0200
Subject: [PATCH] =?UTF-8?q?prevent=20error=20`RawText=20""=20must=20be=20w?=
 =?UTF-8?q?rapped=20in=20an=20explicit=20<Text>=20compo=E2=80=A6=20(#2415)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

this react-native error has no adequate stack, and i waste 4 hours for juggling pieces, until i get the idea to trace error by myself and finded this bug
---
 packages/react-navigation/src/views/Header/HeaderBackButton.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/react-navigation/src/views/Header/HeaderBackButton.js b/packages/react-navigation/src/views/Header/HeaderBackButton.js
index 070f23d0..3760b1cb 100644
--- a/packages/react-navigation/src/views/Header/HeaderBackButton.js
+++ b/packages/react-navigation/src/views/Header/HeaderBackButton.js
@@ -91,7 +91,7 @@ class HeaderBackButton extends React.PureComponent<Props, State> {
             source={asset}
           />
           {Platform.OS === 'ios' &&
-            title && (
+            typeof backButtonTitle === 'string' && (
               <Text
                 onLayout={this._onTextLayout}
                 style={[