diff --git a/VHGithubNotifier.xcodeproj/project.pbxproj b/VHGithubNotifier.xcodeproj/project.pbxproj
index b75a13b..6372c99 100644
--- a/VHGithubNotifier.xcodeproj/project.pbxproj
+++ b/VHGithubNotifier.xcodeproj/project.pbxproj
@@ -1529,7 +1529,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "diff \"${PODS_PODFILE_DIR_PATH}/Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n# This output is used by Xcode 'outputs' to avoid re-running this script phase.\necho \"SUCCESS\" > \"${SCRIPT_OUTPUT_FILE_0}\"\n";
+			shellScript = "diff \"${PODS_PODFILE_DIR_PATH}/Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n";
 			showEnvVarsInLog = 0;
 		};
 		6967F9654F27A5A529E7AF2F /* [CP] Embed Pods Frameworks */ = {
diff --git a/VHGithubNotifier/Info.plist b/VHGithubNotifier/Info.plist
index e0bb665..8fc4433 100644
--- a/VHGithubNotifier/Info.plist
+++ b/VHGithubNotifier/Info.plist
@@ -19,9 +19,9 @@
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.0.2.6</string>
+	<string>1.0.2.7</string>
 	<key>CFBundleVersion</key>
-	<string>1026</string>
+	<string>1027</string>
 	<key>LSMinimumSystemVersion</key>
 	<string>$(MACOSX_DEPLOYMENT_TARGET)</string>
 	<key>LSUIElement</key>
diff --git a/VHGithubNotifier/Model/Manager/VHGithubNotifierManager+UserNotification.m b/VHGithubNotifier/Model/Manager/VHGithubNotifierManager+UserNotification.m
index f7df4fa..abc5199 100644
--- a/VHGithubNotifier/Model/Manager/VHGithubNotifierManager+UserNotification.m
+++ b/VHGithubNotifier/Model/Manager/VHGithubNotifierManager+UserNotification.m
@@ -16,6 +16,7 @@
 #import "VHGithubNotifierManager+Notification.h"
 
 static NSMutableArray<CNUserNotification *> *userNotifications;
+static NSMutableSet<VHNotification *> *cacheNotifications;
 
 @implementation VHGithubNotifierManager (UserNotification)
 
@@ -28,8 +29,7 @@ - (void)innerInitializePropertiesForUserNotification
 
 - (void)addNotifications:(NSArray<VHNotification *> *)notifications
 {
-    @synchronized (userNotifications)
-    {
+    IN_MAIN_THREAD({
         for (VHNotification *notification in notifications)
         {
             CNUserNotification *userNotification = [[CNUserNotification alloc] init];
@@ -38,17 +38,15 @@ - (void)addNotifications:(NSArray<VHNotification *> *)notifications
             userNotification.informativeText = [notification toNowTimeString];
             NSMutableDictionary *userInfo = [NSMutableDictionary dictionaryWithCapacity:4];
             [userInfo setObject:@(VHGithubUserNotificationTypeNotification) forKey:@"type"];
-            if (notification)
-            {
-                [userInfo setObject:notification forKey:@"notification"];
-            }
+            [userInfo setObject:@(notification.notificationId) forKey:@"notificationID"];
             userNotification.hasActionButton = NO;
             userNotification.feature.bannerImage = [VHUtils imageFromNotificationType:notification.type];
             userNotification.userInfo = userInfo;
             [[self userNotifications] push:userNotification];
         }
-    }
-    [self notify];
+        [[self cacheNotifications] addObjectsFromArray:notifications];
+        [self notify];
+    });
 }
 
 #pragma mark - Private Methods
@@ -74,6 +72,44 @@ - (void)notify
     return userNotifications;
 }
 
+- (NSMutableSet<VHNotification *> *)cacheNotifications
+{
+    if (cacheNotifications == nil)
+    {
+        cacheNotifications = [NSMutableSet set];
+    }
+    return cacheNotifications;
+}
+
+- (VHNotification *)cacheNotificationWithID:(long long)notificationID
+{
+    __block VHNotification *cacheNotification = nil;
+    [[self cacheNotifications] enumerateObjectsUsingBlock:^(VHNotification * _Nonnull obj, BOOL * _Nonnull stop) {
+        if (obj.notificationId == notificationID)
+        {
+            cacheNotification = obj;
+            *stop = YES;
+        }
+    }];
+    return cacheNotification;
+}
+
+- (void)removeCacheNotificationWithID:(long long)notificationID
+{
+    __block VHNotification *cacheNotification = nil;
+    [[self cacheNotifications] enumerateObjectsUsingBlock:^(VHNotification * _Nonnull obj, BOOL * _Nonnull stop) {
+        if (obj.notificationId == notificationID)
+        {
+            cacheNotification = obj;
+            *stop = YES;
+        }
+    }];
+    if (cacheNotification)
+    {
+        [[self cacheNotifications] removeObject:cacheNotification];
+    }
+}
+
 - (void)storeRecordOfNotification:(CNUserNotification *)userNotification
 {
     dispatch_async(GLOBAL_QUEUE, ^{
@@ -81,14 +117,17 @@ - (void)storeRecordOfNotification:(CNUserNotification *)userNotification
         {
             RLMRealm *realm = [self realm];
             VHNotificationRecord *record = [[VHNotificationRecord alloc] init];
-            VHNotification *notification = [userNotification.userInfo objectForKey:@"notification"];
-            record.notificationId = notification.notificationId;
-            record.latestUpdateTime = notification.updateDate;
-            if (record.notificationId != 0 && record.latestUpdateTime)
+            VHNotification *notification = [self cacheNotificationWithID:[[userNotification.userInfo objectForKey:@"notificationID"] longLongValue]];
+            if (notification)
             {
-                [realm beginWriteTransaction];
-                [realm addOrUpdateObject:record];
-                [realm commitWriteTransaction];
+                record.notificationId = notification.notificationId;
+                record.latestUpdateTime = notification.updateDate;
+                if (record.notificationId != 0 && record.latestUpdateTime)
+                {
+                    [realm beginWriteTransaction];
+                    [realm addOrUpdateObject:record];
+                    [realm commitWriteTransaction];
+                }
             }
         }
     });
@@ -96,31 +135,32 @@ - (void)storeRecordOfNotification:(CNUserNotification *)userNotification
 
 #pragma mark - NSUserNotificationCenterDelegate
 
-- (void)userNotificationCenter:(NSUserNotificationCenter *)center didDeliverNotification:(NSUserNotification *)notification
+- (void)userNotificationCenter:(NSUserNotificationCenter *)center didDeliverNotification:(NSUserNotification *)userNotification
 {
     
 }
 
-- (void)userNotificationCenter:(NSUserNotificationCenter *)center didActivateNotification:(NSUserNotification *)notification
+- (void)userNotificationCenter:(NSUserNotificationCenter *)center didActivateNotification:(NSUserNotification *)userNotification
 {
-    NSDictionary *userInfo = notification.userInfo;
+    NSDictionary *userInfo = userNotification.userInfo;
     if (userInfo)
     {
         if ([[userInfo objectForKey:@"type"] integerValue] == VHGithubUserNotificationTypeNotification)
         {
-            VHNotification *notification = [userInfo objectForKey:@"notification"];
+            VHNotification *notification = [self cacheNotificationWithID:[[userInfo objectForKey:@"notificationID"] longLongValue]];
             [self openNotificationURLAndMarkAsReadBySettings:notification];
         }
     }
 }
 
-- (BOOL)userNotificationCenter:(NSUserNotificationCenter *)center shouldPresentNotification:(NSUserNotification *)notification
+- (BOOL)userNotificationCenter:(NSUserNotificationCenter *)center shouldPresentNotification:(NSUserNotification *)userNotification
 {
     return YES;
 }
 
-- (void)userNotificationCenter:(CNUserNotificationCenter *)center didRemoveNotification:(CNUserNotification *)notification
+- (void)userNotificationCenter:(CNUserNotificationCenter *)center didRemoveNotification:(CNUserNotification *)userNotification
 {
+    [self removeCacheNotificationWithID:[[userNotification.userInfo objectForKey:@"notificationID"] longLongValue]];
     [self notify];
 }
 
diff --git a/VHGithubNotifier/Model/VHNotification.h b/VHGithubNotifier/Model/VHNotification.h
index 6d99909..05be233 100644
--- a/VHGithubNotifier/Model/VHNotification.h
+++ b/VHGithubNotifier/Model/VHNotification.h
@@ -29,7 +29,7 @@ typedef NS_ENUM(NSUInteger, VHNotificationType)
     VHNotificationTypePullRequest = 2,
 };
 
-@interface VHNotification : NSObject
+@interface VHNotification : NSObject<NSCoding>
 
 @property (nonatomic, assign) long long notificationId;
 @property (nonatomic, strong) NSDate *lastReadDate;
diff --git a/VHGithubNotifier/Model/VHNotification.m b/VHGithubNotifier/Model/VHNotification.m
index 1d33418..e1cf9c8 100644
--- a/VHGithubNotifier/Model/VHNotification.m
+++ b/VHGithubNotifier/Model/VHNotification.m
@@ -98,4 +98,39 @@ - (NSString *)description
             self.htmlUrl];
 }
 
+- (void)encodeWithCoder:(NSCoder *)aCoder
+{
+    [aCoder encodeInt64:self.notificationId forKey:@"notificationId"];
+    [aCoder encodeObject:self.lastReadDate forKey:@"lastReadDate"];
+    [aCoder encodeInteger:self.reason forKey:@"reason"];
+    [aCoder encodeObject:self.repository forKey:@"repository"];
+    [aCoder encodeObject:self.lastCommentUrl forKey:@"lastCommentUrl"];
+    [aCoder encodeObject:self.title forKey:@"title"];
+    [aCoder encodeObject:self.url forKey:@"url"];
+    [aCoder encodeBool:self.unread forKey:@"unread"];
+    [aCoder encodeObject:self.updateDate forKey:@"updateDate"];
+    [aCoder encodeObject:self.htmlUrl forKey:@"htmlUrl"];
+    [aCoder encodeInteger:self.type forKey:@"type"];
+}
+
+- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder
+{
+    self = [super init];
+    if (self)
+    {
+        _notificationId = [aDecoder decodeInt64ForKey:@"notificationId"];
+        _lastReadDate = [aDecoder decodeObjectForKey:@"lastReadDate"];
+        _reason = [aDecoder decodeIntegerForKey:@"reason"];
+        _repository = [aDecoder decodeObjectForKey:@"repository"];
+        _lastCommentUrl = [aDecoder decodeObjectForKey:@"lastCommentUrl"];
+        _title = [aDecoder decodeObjectForKey:@"title"];
+        _url = [aDecoder decodeObjectForKey:@"url"];
+        _unread = [aDecoder decodeBoolForKey:@"unread"];
+        _updateDate = [aDecoder decodeObjectForKey:@"updateDate"];
+        _htmlUrl = [aDecoder decodeObjectForKey:@"htmlUrl"];
+        _type = [aDecoder decodeIntegerForKey:@"type"];
+    }
+    return self;
+}
+
 @end
diff --git a/VHGithubNotifier/Model/VHSimpleRepository.h b/VHGithubNotifier/Model/VHSimpleRepository.h
index a8d7e7b..123b2ac 100644
--- a/VHGithubNotifier/Model/VHSimpleRepository.h
+++ b/VHGithubNotifier/Model/VHSimpleRepository.h
@@ -6,7 +6,7 @@
 //  Copyright © 2017年 黄伟平. All rights reserved.
 //
 
-@interface VHSimpleRepository : NSObject<NSCopying>
+@interface VHSimpleRepository : NSObject<NSCopying, NSCoding>
 
 @property (nonatomic, assign) long long repositoryId;
 @property (nonatomic, strong) NSString *fullName;
diff --git a/VHGithubNotifier/Model/VHSimpleRepository.m b/VHGithubNotifier/Model/VHSimpleRepository.m
index 1918e54..eb81f04 100644
--- a/VHGithubNotifier/Model/VHSimpleRepository.m
+++ b/VHGithubNotifier/Model/VHSimpleRepository.m
@@ -71,4 +71,27 @@ - (NSUInteger)hash
     return self.repositoryId;
 }
 
+- (void)encodeWithCoder:(nonnull NSCoder *)aCoder
+{
+    [aCoder encodeInt64:self.repositoryId forKey:@"repositoryId"];
+    [aCoder encodeObject:self.fullName forKey:@"fullName"];
+    [aCoder encodeObject:self.htmlUrl forKey:@"htmlUrl"];
+    [aCoder encodeObject:self.ownerName forKey:@"ownerName"];
+    [aCoder encodeObject:self.name forKey:@"name"];
+}
+
+- (nullable instancetype)initWithCoder:(nonnull NSCoder *)aDecoder
+{
+    self = [super init];
+    if (self)
+    {
+        _repositoryId = [aDecoder decodeInt64ForKey:@"repositoryId"];
+        _fullName = [aDecoder decodeObjectForKey:@"fullName"];
+        _htmlUrl = [aDecoder decodeObjectForKey:@"htmlUrl"];
+        _ownerName = [aDecoder decodeObjectForKey:@"ownerName"];
+        _name = [aDecoder decodeObjectForKey:@"name"];
+    }
+    return self;
+}
+
 @end