From 46a22e54dc74299e608302d9c80f8375de878c2f Mon Sep 17 00:00:00 2001
From: Anton Kuznetsov <isnifer@gmail.com>
Date: Fri, 17 Nov 2017 18:16:55 +0300
Subject: [PATCH] Fix an error with ExNavigationReducer

---
 src/ExNavigationReducer.js | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/ExNavigationReducer.js b/src/ExNavigationReducer.js
index 1d35c73..78dc33f 100644
--- a/src/ExNavigationReducer.js
+++ b/src/ExNavigationReducer.js
@@ -81,10 +81,12 @@ class ExNavigationReducer {
   }
 
   static [ActionTypes.REMOVE_NAVIGATOR](state, { navigatorUID }) {
-    const currentNavigatorUID =
-      (navigatorsToRestore.length &&
-        navigatorsToRestore[navigatorsToRestore.length - 1]) ||
-      state.navigators[navigatorUID].parentNavigatorUID;
+    let currentNavigatorUID = null
+    if (navigatorsToRestore.length) {
+      currentNavigatorUID = navigatorsToRestore[navigatorsToRestore.length - 1]
+    } else if (state.navigators[navigatorUID]) {
+      currentNavigatorUID = state.navigators[navigatorUID].parentNavigatorUID
+    }
     navigatorsToRestore.pop();
     return {
       ...state,