diff --git a/common/include/input_hub.cpp b/common/include/input_hub.cpp
index 55704f92fee64e95fc9a025cb5b995beddd96c24..6288aa7f27d1a38209374d02234332f0a84f59bd 100644
--- a/common/include/input_hub.cpp
+++ b/common/include/input_hub.cpp
@@ -189,7 +189,12 @@ size_t InputHub::GetEvents(RawEvent *buffer, size_t bufferSize)
         }
         struct input_event readBuffer[bufferSize];
         int32_t readSize = read(eventItem.data.fd, readBuffer, sizeof(struct input_event) * capacity);
-        size_t count = ReadInputEvent(readSize, *GetDeviceByFdLocked(eventItem.data.fd));
+        Device* deviceByFd = GetDeviceByFdLocked(eventItem.data.fd);
+        if (!deviceByFd) {
+            DHLOGE("Find device by fd: %{public}d failed", eventItem.data.fd);
+            continue;
+        }
+        size_t count = ReadInputEvent(readSize, *deviceByFd);
         Device* device = GetSupportDeviceByFd(eventItem.data.fd);
         if (!device) {
             DHLOGE("Can not find device by fd: %{public}d", eventItem.data.fd);
diff --git a/services/sink/transport/src/distributed_input_sink_transport.cpp b/services/sink/transport/src/distributed_input_sink_transport.cpp
index 5b5374937f2a65c8087a2f0a556d0ade443e04fc..df1842d34a1a9be6d7b40929eac6bad145d56f69 100644
--- a/services/sink/transport/src/distributed_input_sink_transport.cpp
+++ b/services/sink/transport/src/distributed_input_sink_transport.cpp
@@ -79,6 +79,10 @@ void DistributedInputSinkTransport::DInputSinkEventHandler::ProcessEvent(const A
     switch (eventId) {
         case EHandlerMsgType::DINPUT_SINK_EVENT_HANDLER_MSG: {
             std::shared_ptr<nlohmann::json> innerMsg = event->GetSharedObject<nlohmann::json>();
+            if (innerMsg == nullptr) {
+                DHLOGE("innerMsg is null.");
+                break;
+            }
             nlohmann::json jsonStr;
             jsonStr[DINPUT_SOFTBUS_KEY_CMD_TYPE] = TRANS_SINK_MSG_BODY_DATA;
             jsonStr[DINPUT_SOFTBUS_KEY_INPUT_DATA] = innerMsg->dump();
diff --git a/services/source/inputinject/src/distributed_input_node_manager.cpp b/services/source/inputinject/src/distributed_input_node_manager.cpp
index af1f751494e1c8e79087b3ed5e250323aff2819a..7828cd1ba17271d368ce04b6a4c161354f154e2a 100644
--- a/services/source/inputinject/src/distributed_input_node_manager.cpp
+++ b/services/source/inputinject/src/distributed_input_node_manager.cpp
@@ -203,6 +203,10 @@ void DistributedInputNodeManager::DInputNodeManagerEventHandler::ScanAllNode(
 {
     DHLOGI("ScanAllNode enter.");
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     auto it = dataMsg->begin();
     nlohmann::json innerMsg = *(it);
     std::string devId = innerMsg[INPUT_NODE_DEVID];
diff --git a/services/source/sourcemanager/src/dinput_source_manager_event_handler.cpp b/services/source/sourcemanager/src/dinput_source_manager_event_handler.cpp
index 0039c9085a5b581abcbe017219e91db1992930d9..4ed70d892142e2a99979bc78f06d1a6b490f7fa0 100644
--- a/services/source/sourcemanager/src/dinput_source_manager_event_handler.cpp
+++ b/services/source/sourcemanager/src/dinput_source_manager_event_handler.cpp
@@ -48,6 +48,10 @@ DInputSourceManagerEventHandler::~DInputSourceManagerEventHandler()
 void DInputSourceManagerEventHandler::NotifyRegisterCallback(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     auto it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsString(innerMsg, INPUT_SOURCEMANAGER_KEY_DEVID) ||
@@ -80,6 +84,10 @@ void DInputSourceManagerEventHandler::NotifyRegisterCallback(const AppExecFwk::I
 void DInputSourceManagerEventHandler::NotifyUnregisterCallback(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     auto it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsString(innerMsg, INPUT_SOURCEMANAGER_KEY_DEVID) ||
@@ -101,6 +109,10 @@ void DInputSourceManagerEventHandler::NotifyUnregisterCallback(const AppExecFwk:
 void DInputSourceManagerEventHandler::NotifyPrepareCallback(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     auto it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsString(innerMsg, INPUT_SOURCEMANAGER_KEY_DEVID) ||
@@ -120,6 +132,10 @@ void DInputSourceManagerEventHandler::NotifyPrepareCallback(const AppExecFwk::In
 void DInputSourceManagerEventHandler::NotifyUnprepareCallback(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     auto it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsString(innerMsg, INPUT_SOURCEMANAGER_KEY_DEVID) ||
@@ -139,6 +155,10 @@ void DInputSourceManagerEventHandler::NotifyUnprepareCallback(const AppExecFwk::
 void DInputSourceManagerEventHandler::NotifyStartCallback(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     auto it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsString(innerMsg, INPUT_SOURCEMANAGER_KEY_DEVID) ||
@@ -165,6 +185,10 @@ void DInputSourceManagerEventHandler::NotifyStartCallback(const AppExecFwk::Inne
 void DInputSourceManagerEventHandler::NotifyStopCallback(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     auto it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsString(innerMsg, INPUT_SOURCEMANAGER_KEY_DEVID) ||
@@ -202,6 +226,10 @@ void DInputSourceManagerEventHandler::NotifyStopCallback(const AppExecFwk::Inner
 void DInputSourceManagerEventHandler::NotifyStartDhidCallback(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     auto it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsString(innerMsg, INPUT_SOURCEMANAGER_KEY_DEVID) ||
@@ -221,6 +249,10 @@ void DInputSourceManagerEventHandler::NotifyStartDhidCallback(const AppExecFwk::
 void DInputSourceManagerEventHandler::NotifyStopDhidCallback(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     auto it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsString(innerMsg, INPUT_SOURCEMANAGER_KEY_DEVID) ||
@@ -240,6 +272,10 @@ void DInputSourceManagerEventHandler::NotifyStopDhidCallback(const AppExecFwk::I
 void DInputSourceManagerEventHandler::NotifyKeyStateCallback(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     auto it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsString(innerMsg, INPUT_SOURCEMANAGER_KEY_DEVID) ||
@@ -262,6 +298,10 @@ void DInputSourceManagerEventHandler::NotifyKeyStateCallback(const AppExecFwk::I
 void DInputSourceManagerEventHandler::NotifyStartServerCallback(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     auto it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsInt32(innerMsg, INPUT_SOURCEMANAGER_KEY_RESULT)) {
@@ -277,6 +317,10 @@ void DInputSourceManagerEventHandler::NotifyStartServerCallback(const AppExecFwk
 void DInputSourceManagerEventHandler::NotifyRelayPrepareCallback(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     nlohmann::json::iterator it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsInt32(innerMsg, INPUT_SOURCEMANAGER_KEY_VALUE) ||
@@ -295,6 +339,10 @@ void DInputSourceManagerEventHandler::NotifyRelayPrepareCallback(const AppExecFw
 void DInputSourceManagerEventHandler::NotifyRelayUnprepareCallback(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     nlohmann::json::iterator it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsInt32(innerMsg, INPUT_SOURCEMANAGER_KEY_VALUE) ||
@@ -313,6 +361,10 @@ void DInputSourceManagerEventHandler::NotifyRelayUnprepareCallback(const AppExec
 void DInputSourceManagerEventHandler::NotifyRelayPrepareRemoteInput(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     nlohmann::json::iterator it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsString(innerMsg, INPUT_SOURCEMANAGER_KEY_DEVID) ||
@@ -345,6 +397,10 @@ void DInputSourceManagerEventHandler::NotifyRelayPrepareRemoteInput(const AppExe
 void DInputSourceManagerEventHandler::NotifyRelayUnprepareRemoteInput(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     nlohmann::json::iterator it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsString(innerMsg, INPUT_SOURCEMANAGER_KEY_DEVID) ||
@@ -373,6 +429,10 @@ void DInputSourceManagerEventHandler::NotifyRelayUnprepareRemoteInput(const AppE
 void DInputSourceManagerEventHandler::NotifyRelayStartDhidCallback(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     nlohmann::json::iterator it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsInt32(innerMsg, INPUT_SOURCEMANAGER_KEY_VALUE) ||
@@ -393,6 +453,10 @@ void DInputSourceManagerEventHandler::NotifyRelayStartDhidCallback(const AppExec
 void DInputSourceManagerEventHandler::NotifyRelayStopDhidCallback(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     nlohmann::json::iterator it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsInt32(innerMsg, INPUT_SOURCEMANAGER_KEY_VALUE) ||
@@ -413,6 +477,10 @@ void DInputSourceManagerEventHandler::NotifyRelayStopDhidCallback(const AppExecF
 void DInputSourceManagerEventHandler::NotifyRelayStartTypeCallback(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     nlohmann::json::iterator it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsInt32(innerMsg, INPUT_SOURCEMANAGER_KEY_VALUE) ||
@@ -433,6 +501,10 @@ void DInputSourceManagerEventHandler::NotifyRelayStartTypeCallback(const AppExec
 void DInputSourceManagerEventHandler::NotifyRelayStopTypeCallback(const AppExecFwk::InnerEvent::Pointer &event)
 {
     std::shared_ptr<nlohmann::json> dataMsg = event->GetSharedObject<nlohmann::json>();
+    if (dataMsg == nullptr) {
+        DHLOGE("dataMsg is null.");
+        return;
+    }
     nlohmann::json::iterator it = dataMsg->begin();
     nlohmann::json innerMsg = *it;
     if (!IsInt32(innerMsg, INPUT_SOURCEMANAGER_KEY_VALUE) ||