diff --git a/SensorsAnalyticsSDK.podspec b/SensorsAnalyticsSDK.podspec
index 2147053b..32ac1eca 100644
--- a/SensorsAnalyticsSDK.podspec
+++ b/SensorsAnalyticsSDK.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "SensorsAnalyticsSDK"
-  s.version      = "4.4.0"
+  s.version      = "4.4.1"
   s.summary      = "The official iOS SDK of Sensors Analytics."
   s.homepage     = "http://www.sensorsdata.cn"
   s.source       = { :git => 'https://github.com/sensorsdata/sa-sdk-ios.git', :tag => "v#{s.version}" }
@@ -22,7 +22,7 @@ Pod::Spec.new do |s|
     core_dir = "SensorsAnalyticsSDK/Core/"
     b.source_files = core_dir + "**/*.{h,m}"
     b.exclude_files = core_dir + "SAAlertController.h", core_dir + "SAAlertController.m"
-    b.public_header_files = core_dir + "SensorsAnalyticsSDK.h", core_dir + "SensorsAnalyticsSDK+Public.h", core_dir + "SASecurityPolicy.h", core_dir + "SAConfigOptions.h", core_dir + "SAConstants.h", core_dir + "PropertyPlugin/SAPropertyPluginProtocol.h"
+    b.public_header_files = core_dir + "SensorsAnalyticsSDK.h", core_dir + "SensorsAnalyticsSDK+Public.h", core_dir + "SASecurityPolicy.h", core_dir + "SAConfigOptions.h", core_dir + "SAConstants.h", core_dir + "PropertyPlugin/SAPropertyPlugin.h"
     b.resource = 'SensorsAnalyticsSDK/SensorsAnalyticsSDK.bundle'
     b.ios.frameworks = 'CoreTelephony'
     b.dependency 'SensorsAnalyticsSDK/__Store'
diff --git a/SensorsAnalyticsSDK/Core/Interceptor/Flush/SAFlushInterceptor.m b/SensorsAnalyticsSDK/Core/Interceptor/Flush/SAFlushInterceptor.m
index 5807d879..0ff38a10 100644
--- a/SensorsAnalyticsSDK/Core/Interceptor/Flush/SAFlushInterceptor.m
+++ b/SensorsAnalyticsSDK/Core/Interceptor/Flush/SAFlushInterceptor.m
@@ -83,7 +83,6 @@ - (void)requestWithInput:(SAFlowData *)input completion:(void (^)(BOOL success))
     SAURLSessionTaskCompletionHandler handler = ^(NSData * _Nullable data, NSHTTPURLResponse * _Nullable response, NSError * _Nullable error) {
         if (error || ![response isKindOfClass:[NSHTTPURLResponse class]]) {
             input.message = [NSString stringWithFormat:@"%@ network failure: %@", self, error ? error : @"Unknown error"];
-            input.state = SAFlowStateStop;
             return completion(NO);
         }
 
@@ -115,9 +114,8 @@ - (void)requestWithInput:(SAFlowData *)input completion:(void (^)(BOOL success))
         BOOL flushSuccess = input.configOptions.debugMode != SensorsAnalyticsDebugOff || successCode;
         if (!flushSuccess) {
             input.message = [NSString stringWithFormat:@"flush failed, statusCode: %ld",statusCode];
-            input.state = SAFlowStateStop;
         }
-        completion(YES);
+        completion(flushSuccess);
     };
 
     NSURLRequest *request = [self buildFlushRequestWithInput:input];
diff --git a/SensorsAnalyticsSDK/Core/PropertyPlugin/SAPropertyPlugin.h b/SensorsAnalyticsSDK/Core/PropertyPlugin/SAPropertyPlugin.h
index c44c8187..953c7f93 100644
--- a/SensorsAnalyticsSDK/Core/PropertyPlugin/SAPropertyPlugin.h
+++ b/SensorsAnalyticsSDK/Core/PropertyPlugin/SAPropertyPlugin.h
@@ -48,8 +48,6 @@ typedef NS_ENUM(NSUInteger, SAPropertyPluginPriority) {
 @property (nonatomic, copy, readonly) NSString *event;
 @property (nonatomic, assign, readonly) SAEventType type;
 @property (nonatomic, assign, readonly) UInt64 time;
-/// 开机时间，用于统计事件时长
-@property (nonatomic, assign, readonly) UInt64 currentSystemUpTime;
 
 @property (nonatomic, strong, readonly) id<SAPropertyPluginLibFilter> lib;
 
diff --git a/SensorsAnalyticsSDK/Core/SAConfigOptions.m b/SensorsAnalyticsSDK/Core/SAConfigOptions.m
index 69fde294..c35d0549 100644
--- a/SensorsAnalyticsSDK/Core/SAConfigOptions.m
+++ b/SensorsAnalyticsSDK/Core/SAConfigOptions.m
@@ -67,12 +67,9 @@ @interface SAConfigOptions ()<NSCopying>
 @property (nonatomic, assign) BOOL enableDeviceOrientation;
 @property (nonatomic, assign) BOOL enableRemoteConfig;
 @property (nonatomic, assign) BOOL enableChannelMatch;
-@property (nonatomic, assign) BOOL enableDebugMode;
 @property (nonatomic, assign) BOOL enableDeepLink;
 @property (nonatomic, assign) BOOL enableAutoTrack;
 
-//@property (nonatomic) SensorsAnalyticsDebugMode debugMode;
-
 @end
 
 @implementation SAConfigOptions
@@ -111,7 +108,6 @@ - (instancetype)initWithServerURL:(NSString *)serverURL launchOptions:(id)launch
         //default private switch
         _enableRemoteConfig = YES;
         _enableChannelMatch = YES;
-        _enableDebugMode = YES;
         _enableDeepLink = YES;
         _enableAutoTrack = YES;
 
@@ -178,7 +174,6 @@ - (id)copyWithZone:(nullable NSZone *)zone {
     //private switch
     options.enableRemoteConfig = self.enableRemoteConfig;
     options.enableChannelMatch = self.enableChannelMatch;
-    options.enableDebugMode = self.enableDebugMode;
     options.enableDeepLink = self.enableDeepLink;
     options.enableAutoTrack = self.enableAutoTrack;
     options.customADChannelURL = self.customADChannelURL;
diff --git a/SensorsAnalyticsSDK/Core/SensorsAnalyticsSDK+Private.h b/SensorsAnalyticsSDK/Core/SensorsAnalyticsSDK+Private.h
index 6efcc43a..f3a69666 100644
--- a/SensorsAnalyticsSDK/Core/SensorsAnalyticsSDK+Private.h
+++ b/SensorsAnalyticsSDK/Core/SensorsAnalyticsSDK+Private.h
@@ -57,9 +57,6 @@
 /// 需要在队列外执行
 - (void)buildDynamicSuperProperties;
 
-/// 注册属性插件
-- (void)registerPropertyPlugin:(SAPropertyPlugin *)plugin;
-
 #pragma mark - property
 @property (nonatomic, strong, readonly) SAConfigOptions *configOptions;
 @property (nonatomic, strong, readonly) SANetwork *network;
diff --git a/SensorsAnalyticsSDK/Core/SensorsAnalyticsSDK+Public.h b/SensorsAnalyticsSDK/Core/SensorsAnalyticsSDK+Public.h
index 571136cd..49c7e8b1 100644
--- a/SensorsAnalyticsSDK/Core/SensorsAnalyticsSDK+Public.h
+++ b/SensorsAnalyticsSDK/Core/SensorsAnalyticsSDK+Public.h
@@ -20,6 +20,7 @@
 
 #import <Foundation/Foundation.h>
 #import "SAConstants.h"
+#import "SAPropertyPlugin.h"
 
 @class SASecurityPolicy;
 @class SAConfigOptions;
@@ -417,6 +418,14 @@ extern NSString * const SensorsAnalyticsIdentityKeyEmail;
  */
 - (NSDictionary *)currentSuperProperties;
 
+/**
+ * @abstract
+ * 注册属性插件
+ *
+ * @param plugin 属性插件对象
+ */
+- (void)registerPropertyPlugin:(SAPropertyPlugin *)plugin;
+
 /**
  * @abstract
  * 得到 SDK 的版本
diff --git a/SensorsAnalyticsSDK/Core/SensorsAnalyticsSDK.m b/SensorsAnalyticsSDK/Core/SensorsAnalyticsSDK.m
index 7ef63cfe..b08ec0e7 100755
--- a/SensorsAnalyticsSDK/Core/SensorsAnalyticsSDK.m
+++ b/SensorsAnalyticsSDK/Core/SensorsAnalyticsSDK.m
@@ -62,7 +62,7 @@
 #import "SASessionPropertyPlugin.h"
 #import "SAEventStore.h"
 
-#define VERSION @"4.4.0"
+#define VERSION @"4.4.1"
 
 void *SensorsAnalyticsQueueTag = &SensorsAnalyticsQueueTag;
 
@@ -1188,6 +1188,11 @@ - (void)trackFromH5WithEventObject:(SABaseEventObject *)object properties:(NSDic
 #pragma mark - Deprecated
 @implementation SensorsAnalyticsSDK (Deprecated)
 
+// 广告 SDK 调用，暂时保留
+- (void)asyncTrackEventObject:(SABaseEventObject *)object properties:(NSDictionary *)properties {
+    [self trackEventObject:object properties:properties];
+}
+
 - (NSInteger)flushInterval {
     @synchronized(self) {
         return self.configOptions.flushInterval;
diff --git a/SensorsAnalyticsSDK/Core/TrackTimer/SAEventDurationPropertyPlugin.m b/SensorsAnalyticsSDK/Core/TrackTimer/SAEventDurationPropertyPlugin.m
index 0bb2b5f4..91139161 100644
--- a/SensorsAnalyticsSDK/Core/TrackTimer/SAEventDurationPropertyPlugin.m
+++ b/SensorsAnalyticsSDK/Core/TrackTimer/SAEventDurationPropertyPlugin.m
@@ -25,6 +25,7 @@
 #import "SAEventDurationPropertyPlugin.h"
 #import "SAConstants+Private.h"
 #import "SAPropertyPlugin+SAPrivate.h"
+#import "SABaseEventObject.h"
 
 @interface SAEventDurationPropertyPlugin()
 @property (nonatomic, weak) SATrackTimer *trackTimer;
@@ -57,10 +58,12 @@ - (SAPropertyPluginPriority)priority {
 }
 
 - (NSDictionary<NSString *,id> *)properties {
-    if (!self.filter) {
+    if (![self.filter isKindOfClass:SABaseEventObject.class]) {
         return nil;
     }
-    NSNumber *eventDuration = [self.trackTimer eventDurationFromEventId:self.filter.event currentSysUpTime:self.filter.currentSystemUpTime];
+
+    SABaseEventObject *eventObject = (SABaseEventObject *)self.filter;
+    NSNumber *eventDuration = [self.trackTimer eventDurationFromEventId:eventObject.eventId currentSysUpTime:eventObject.currentSystemUpTime];
     if (!eventDuration) {
         return nil;
     }
diff --git a/SensorsAnalyticsSDK/DebugMode/SADebugModeManager.m b/SensorsAnalyticsSDK/DebugMode/SADebugModeManager.m
index d51a4465..88892dc1 100644
--- a/SensorsAnalyticsSDK/DebugMode/SADebugModeManager.m
+++ b/SensorsAnalyticsSDK/DebugMode/SADebugModeManager.m
@@ -67,6 +67,13 @@ - (void)setConfigOptions:(SAConfigOptions *)configOptions {
     self.enable = configOptions.debugMode != SensorsAnalyticsDebugOff;
 }
 
+- (BOOL)isEnable {
+    if ([SAApplication isAppExtension]) {
+        return NO;
+    }
+    return self.configOptions.debugMode != SensorsAnalyticsDebugOff;
+}
+
 #pragma mark - SAOpenURLProtocol
 
 - (BOOL)canHandleURL:(nonnull NSURL *)url {
diff --git a/SensorsAnalyticsSDK/Visualized/Config/SAVisualPropertiesConfigSources.h b/SensorsAnalyticsSDK/Visualized/Config/SAVisualPropertiesConfigSources.h
index 1edc639e..1f186aa3 100644
--- a/SensorsAnalyticsSDK/Visualized/Config/SAVisualPropertiesConfigSources.h
+++ b/SensorsAnalyticsSDK/Visualized/Config/SAVisualPropertiesConfigSources.h
@@ -54,7 +54,7 @@ NS_ASSUME_NONNULL_BEGIN
 /// 禁用默认初始化
 - (instancetype)init NS_UNAVAILABLE;
 /// 禁用默认初始化
-- (instancetype)new NS_UNAVAILABLE;
++ (instancetype)new NS_UNAVAILABLE;
 
 /// 加载配置
 - (void)loadConfig;
diff --git a/SensorsAnalyticsSDK/Visualized/VisualProperties/ViewNode/SAViewNodeTree.h b/SensorsAnalyticsSDK/Visualized/VisualProperties/ViewNode/SAViewNodeTree.h
index 0f364d0b..b705af78 100644
--- a/SensorsAnalyticsSDK/Visualized/VisualProperties/ViewNode/SAViewNodeTree.h
+++ b/SensorsAnalyticsSDK/Visualized/VisualProperties/ViewNode/SAViewNodeTree.h
@@ -36,7 +36,7 @@ NS_ASSUME_NONNULL_BEGIN
 /// 禁用默认初始化
 - (instancetype)init NS_UNAVAILABLE;
 /// 禁用默认初始化
-- (instancetype)new NS_UNAVAILABLE;
++ (instancetype)new NS_UNAVAILABLE;
 
 /// 视图添加或移除
 - (void)didMoveToSuperviewWithView:(UIView *)view;