diff --git a/core/bus_center/ipc/standard/src/bus_center_client_proxy.cpp b/core/bus_center/ipc/standard/src/bus_center_client_proxy.cpp
index a82b71fb5520b02278a4af695bbe918d14c1048e..13ddbe93a7f617784dec0f3761e09f66b5c3217c 100644
--- a/core/bus_center/ipc/standard/src/bus_center_client_proxy.cpp
+++ b/core/bus_center/ipc/standard/src/bus_center_client_proxy.cpp
@@ -68,6 +68,10 @@ int32_t ClinetOnNodeOnlineStateChanged(bool isOnline, void *info, uint32_t infoT
     SoftbusClientInfoManager::GetInstance().GetSoftbusClientProxyMap(proxyMap);
     for (auto proxy : proxyMap) {
         sptr<BusCenterClientProxy> clientProxy = new (std::nothrow) BusCenterClientProxy(proxy.second);
+        if (clientProxy == nullptr) {
+            LNN_LOGE(LNN_EVENT, "bus center client proxy is nullptr");
+            return SOFTBUS_NETWORK_GET_CLIENT_PROXY_NULL;
+        }
         clientProxy->OnNodeOnlineStateChanged(proxy.first.c_str(), isOnline, info, infoTypeLen);
     }
     return SOFTBUS_OK;
@@ -79,6 +83,10 @@ int32_t ClinetOnNodeBasicInfoChanged(void *info, uint32_t infoTypeLen, int32_t t
     SoftbusClientInfoManager::GetInstance().GetSoftbusClientProxyMap(proxyMap);
     for (auto proxy : proxyMap) {
         sptr<BusCenterClientProxy> clientProxy = new (std::nothrow) BusCenterClientProxy(proxy.second);
+        if (clientProxy == nullptr) {
+            LNN_LOGE(LNN_EVENT, "bus center client proxy is nullptr");
+            return SOFTBUS_NETWORK_GET_CLIENT_PROXY_NULL;
+        }
         clientProxy->OnNodeBasicInfoChanged(proxy.first.c_str(), info, infoTypeLen, type);
     }
     return SOFTBUS_OK;
@@ -94,6 +102,10 @@ int32_t ClientOnNodeStatusChanged(void *info, uint32_t infoTypeLen, int32_t type
     }
     for (const auto &proxy : proxyMap) {
         sptr<BusCenterClientProxy> clientProxy = new (std::nothrow) BusCenterClientProxy(proxy.second);
+        if (clientProxy == nullptr) {
+            LNN_LOGE(LNN_EVENT, "bus center client proxy is nullptr");
+            return SOFTBUS_NETWORK_GET_CLIENT_PROXY_NULL;
+        }
         clientProxy->OnNodeStatusChanged(proxy.first.c_str(), info, infoTypeLen, type);
     }
     return SOFTBUS_OK;
@@ -105,6 +117,10 @@ int32_t ClinetOnLocalNetworkIdChanged()
     SoftbusClientInfoManager::GetInstance().GetSoftbusClientProxyMap(proxyMap);
     for (auto proxy : proxyMap) {
         sptr<BusCenterClientProxy> clientProxy = new (std::nothrow) BusCenterClientProxy(proxy.second);
+        if (clientProxy == nullptr) {
+            LNN_LOGE(LNN_EVENT, "bus center client proxy is nullptr");
+            return SOFTBUS_NETWORK_GET_CLIENT_PROXY_NULL;
+        }
         clientProxy->OnLocalNetworkIdChanged(proxy.first.c_str());
     }
     return SOFTBUS_OK;
@@ -120,6 +136,10 @@ int32_t ClinetNotifyDeviceNotTrusted(const char *msg)
             continue;
         }
         sptr<BusCenterClientProxy> clientProxy = new (std::nothrow) BusCenterClientProxy(proxy.second);
+        if (clientProxy == nullptr) {
+            LNN_LOGE(LNN_EVENT, "bus center client proxy is nullptr");
+            return SOFTBUS_NETWORK_GET_CLIENT_PROXY_NULL;
+        }
         clientProxy->OnNodeDeviceNotTrusted(proxy.first.c_str(), msg);
     }
     return SOFTBUS_OK;
diff --git a/core/bus_center/lnn/lane_hub/heartbeat/src/lnn_heartbeat_ctrl.c b/core/bus_center/lnn/lane_hub/heartbeat/src/lnn_heartbeat_ctrl.c
index 411c7ce42b9f146634b0c83964f60baf0a9aaa69..95cd9f865c475aa8ea9744fbab636093ae8718a3 100644
--- a/core/bus_center/lnn/lane_hub/heartbeat/src/lnn_heartbeat_ctrl.c
+++ b/core/bus_center/lnn/lane_hub/heartbeat/src/lnn_heartbeat_ctrl.c
@@ -1226,6 +1226,7 @@ void LnnDeinitHeartbeat(void)
     LnnUnregisterEventHandler(LNN_EVENT_NIGHT_MODE_CHANGED, HbNightModeStateEventHandler);
     LnnUnregisterEventHandler(LNN_EVENT_OOBE_STATE_CHANGED, HbOOBEStateEventHandler);
     LnnUnregisterEventHandler(LNN_EVENT_LP_EVENT_REPORT, HbLpEventHandler);
+    LnnUnregisterEventHandler(LNN_EVENT_USER_SWITCHED, HbUserSwitchedHandler);
 }
 
 int32_t LnnTriggerDataLevelHeartbeat(void)
diff --git a/core/bus_center/lnn/net_builder/src/lnn_net_builder_init.c b/core/bus_center/lnn/net_builder/src/lnn_net_builder_init.c
index e65f008e9dac0d1eb2e142c02edf0dfa0c8f0930..3aca317be15d3dc04e31246ab56365703baac9f0 100644
--- a/core/bus_center/lnn/net_builder/src/lnn_net_builder_init.c
+++ b/core/bus_center/lnn/net_builder/src/lnn_net_builder_init.c
@@ -770,6 +770,7 @@ void LnnDeinitNetBuilder(void)
     LnnUnregSyncInfoHandler(LNN_INFO_TYPE_MASTER_ELECT, OnReceiveMasterElectMsg);
     LnnUnregSyncInfoHandler(LNN_INFO_TYPE_NODE_ADDR, OnReceiveNodeAddrChangedMsg);
     LnnUnregisterEventHandler(LNN_EVENT_ACCOUNT_CHANGED, AccountStateChangeHandler);
+    LnnUnregisterEventHandler(LNN_EVENT_USER_SWITCHED, UserSwitchedHandler);
     UnregAuthVerifyListener();
     LnnDeinitTopoManager();
     DeinitNodeInfoSync();
diff --git a/core/bus_center/lnn/net_builder/src/lnn_network_info.c b/core/bus_center/lnn/net_builder/src/lnn_network_info.c
index 04282ddfd9648e16ca2929846725f6936668841a..88aa0a176948fe195c87c1de2ea7e654158c221c 100644
--- a/core/bus_center/lnn/net_builder/src/lnn_network_info.c
+++ b/core/bus_center/lnn/net_builder/src/lnn_network_info.c
@@ -508,5 +508,7 @@ int32_t LnnInitNetworkInfo(void)
 
 void LnnDeinitNetworkInfo(void)
 {
+    (void)LnnUnregisterEventHandler(LNN_EVENT_BT_STATE_CHANGED, BtStateChangeEventHandler);
+    (void)LnnUnregisterEventHandler(LNN_EVENT_WIFI_STATE_CHANGED, WifiStateEventHandler);
     (void)LnnUnregSyncInfoHandler(LNN_INFO_TYPE_CAPABILITY, OnReceiveCapaSyncInfoMsg);
 }
diff --git a/interfaces/kits/common/softbus_error_code.h b/interfaces/kits/common/softbus_error_code.h
index 5ada1e73eadaacb09319576b9039404db799e426..153abe4dedf59a903b5bcf54a3ae9951491a6369 100644
--- a/interfaces/kits/common/softbus_error_code.h
+++ b/interfaces/kits/common/softbus_error_code.h
@@ -596,6 +596,7 @@ enum SoftBusErrNo {
     SOFTBUS_NETWORK_HB_TRANSACT_PROCESS_FAIL,
     SOFTBUS_NETWORK_HB_CHECK_DEV_STATUS_ERROR,
     SOFTBUS_NETWORK_WRITEINT16_FAILED,
+    SOFTBUS_NETWORK_GET_CLIENT_PROXY_NULL,
 
     /* errno begin: -((203 << 21) | (4 << 16) | (1 << 12) | 0x0FFF) */
     SOFTBUS_LANE_ERR_BASE = SOFTBUS_SUB_ERRNO(LNN_SUB_MODULE_CODE, LNN_LANE_MODULE_CODE),