From 0ab5636145e33b26febae1de23b82bc3e06109ed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=99=BD=E5=AE=87=E4=B8=9C?= <summer88123@163.com>
Date: Wed, 13 Feb 2019 14:00:14 +0800
Subject: [PATCH] InnerNaviBar navigation undefined check

---
 src/navibar.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/navibar.js b/src/navibar.js
index 1f47f5b..416f217 100644
--- a/src/navibar.js
+++ b/src/navibar.js
@@ -32,12 +32,12 @@ export class InnerNaviBar extends React.PureComponent {
             left: null,
             right: null,
         };
-        this._didFocusSubscription = props.navigation.addListener('didFocus',
+        this._didFocusSubscription = props.navigation && props.navigation.addListener('didFocus',
             () => BackHandler.addEventListener('hardwareBackPress', this._clickBack));
     }
 
     componentDidMount() {
-        this._willBlurSubscription = this.props.navigation.addListener('willBlur',
+        this._willBlurSubscription = this.props.navigation && this.props.navigation.addListener('willBlur',
             () => BackHandler.removeEventListener('hardwareBackPress', this._clickBack));
         Dimensions.addEventListener('change', this._onWindowChanged);
     }