From cabe5b5df2c1d31cd5fd3eeccbea32fa79cf404c Mon Sep 17 00:00:00 2001
From: Abyss777 <abyss@fox5.ru>
Date: Thu, 27 Jul 2017 14:57:22 +0500
Subject: Initialize some maps, because they might be accessed before
 initialized.

---
 src/org/traccar/database/DeviceManager.java  | 6 ++++++
 src/org/traccar/database/DriversManager.java | 3 +++
 src/org/traccar/database/UsersManager.java   | 3 +++
 3 files changed, 12 insertions(+)

diff --git a/src/org/traccar/database/DeviceManager.java b/src/org/traccar/database/DeviceManager.java
index 4aafe6631..5d123f9b8 100644
--- a/src/org/traccar/database/DeviceManager.java
+++ b/src/org/traccar/database/DeviceManager.java
@@ -57,6 +57,12 @@ public class DeviceManager extends BaseObjectManager<Device> implements Identity
     public DeviceManager(DataManager dataManager) {
         super(dataManager, Device.class);
         this.config = Context.getConfig();
+        if (devicesByPhone == null) {
+            devicesByPhone = new ConcurrentHashMap<>();
+        }
+        if (devicesByUniqueId == null) {
+            devicesByUniqueId = new ConcurrentHashMap<>();
+        }
         dataRefreshDelay = config.getLong("database.refreshDelay", DEFAULT_REFRESH_DELAY) * 1000;
         lookupGroupsAttribute = config.getBoolean("deviceManager.lookupGroupsAttribute");
         fallbackToText = config.getBoolean("command.fallbackToSms");
diff --git a/src/org/traccar/database/DriversManager.java b/src/org/traccar/database/DriversManager.java
index d3866a5f0..9defa1931 100644
--- a/src/org/traccar/database/DriversManager.java
+++ b/src/org/traccar/database/DriversManager.java
@@ -27,6 +27,9 @@ public class DriversManager extends ExtendedObjectManager<Driver> {
 
     public DriversManager(DataManager dataManager) {
         super(dataManager, Driver.class);
+        if (driversByUniqueId == null) {
+            driversByUniqueId = new ConcurrentHashMap<>();
+        }
     }
 
     private void putUniqueDriverId(Driver driver) {
diff --git a/src/org/traccar/database/UsersManager.java b/src/org/traccar/database/UsersManager.java
index 28e6a31b2..ed39f6cfa 100644
--- a/src/org/traccar/database/UsersManager.java
+++ b/src/org/traccar/database/UsersManager.java
@@ -29,6 +29,9 @@ public class UsersManager extends SimpleObjectManager<User> {
 
     public UsersManager(DataManager dataManager) {
         super(dataManager, User.class);
+        if (usersTokens == null) {
+            usersTokens = new ConcurrentHashMap<>();
+        }
     }
 
     private void putToken(User user) {
-- 
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