From dd09b5c7ed235088d86ba9898261d74228b825ee Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton@traccar.org>
Date: Fri, 28 Oct 2022 13:52:49 -0700
Subject: Support default map (fix #1002)

---
 modern/src/common/util/preferences.js | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

(limited to 'modern/src/common/util/preferences.js')

diff --git a/modern/src/common/util/preferences.js b/modern/src/common/util/preferences.js
index fb8bb4f2..229b6f17 100644
--- a/modern/src/common/util/preferences.js
+++ b/modern/src/common/util/preferences.js
@@ -1,19 +1,21 @@
 import { useSelector } from 'react-redux';
 
+const containsProperty = (object, key) => object.hasOwnProperty(key) && object[key] !== null;
+
 export const usePreference = (key, defaultValue) => useSelector((state) => {
   if (state.session.server.forceSettings) {
-    if (state.session.server.hasOwnProperty(key)) {
+    if (containsProperty(state.session.server, key)) {
       return state.session.server[key];
     }
-    if (state.session.user.hasOwnProperty(key)) {
+    if (containsProperty(state.session.user, key)) {
       return state.session.user[key];
     }
     return defaultValue;
   }
-  if (state.session.user.hasOwnProperty(key)) {
+  if (containsProperty(state.session.user, key)) {
     return state.session.user[key];
   }
-  if (state.session.server.hasOwnProperty(key)) {
+  if (containsProperty(state.session.server, key)) {
     return state.session.server[key];
   }
   return defaultValue;
@@ -21,18 +23,18 @@ export const usePreference = (key, defaultValue) => useSelector((state) => {
 
 export const useAttributePreference = (key, defaultValue) => useSelector((state) => {
   if (state.session.server.forceSettings) {
-    if (state.session.server.attributes.hasOwnProperty(key)) {
+    if (containsProperty(state.session.server.attributes, key)) {
       return state.session.server.attributes[key];
     }
-    if (state.session.user.attributes.hasOwnProperty(key)) {
+    if (containsProperty(state.session.user.attributes, key)) {
       return state.session.user.attributes[key];
     }
     return defaultValue;
   }
-  if (state.session.user.attributes.hasOwnProperty(key)) {
+  if (containsProperty(state.session.user.attributes, key)) {
     return state.session.user.attributes[key];
   }
-  if (state.session.server.attributes.hasOwnProperty(key)) {
+  if (containsProperty(state.session.server.attributes, key)) {
     return state.session.server.attributes[key];
   }
   return defaultValue;
-- 
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