diff --git a/src/common/iflytek_ai_assistant.cpp b/src/common/iflytek_ai_assistant.cpp
index 5572dea8..c9f37ca7 100644
--- a/src/common/iflytek_ai_assistant.cpp
+++ b/src/common/iflytek_ai_assistant.cpp
@@ -271,7 +271,7 @@ IflytekAiAssistant::CallStatus IflytekAiAssistant::stopTtsDirectly() const
     // BUG-301561 : disable stop tts when close tab or window
 #ifdef ENABLE_STOP_TTS
     qDebug() << "ENABLE_STOP_TTS is defined!";
-    return stopTtsDirectlyInternal()
+    return stopTtsDirectlyInternal();
 #else
     qDebug() << "ENABLE_STOP_TTS is not defined!, return Enable";
     return Enable;
diff --git a/src/editor/FlashTween.h b/src/editor/FlashTween.h
index 15e685b6..18b78666 100644
--- a/src/editor/FlashTween.h
+++ b/src/editor/FlashTween.h
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2011-2022 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2011-2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -27,10 +27,10 @@ class FlashTween :public QObject
 
     void startX(qreal t,qreal b,qreal c,qreal d, FunSlideInertial fSlideGesture);
     void startY(qreal t,qreal b,qreal c,qreal d, FunSlideInertial fSlideGesture);
-    void stopX(){m_timerX->stop();}
-    void stopY(){m_timerY->stop();}
-    bool activeX(){return m_timerX->isActive();}
-    bool activeY(){return m_timerY->isActive();}
+    void stopX(){if (m_timerX != nullptr) m_timerX->stop();}
+    void stopY(){if (m_timerY != nullptr) m_timerY->stop();}
+    bool activeX(){return m_timerX != nullptr && m_timerX->isActive();}
+    bool activeY(){return m_timerY != nullptr && m_timerY->isActive();}
 
 private slots:
     void __runY();
diff --git a/src/editor/deletebackcommond.cpp b/src/editor/deletebackcommond.cpp
index 3d61fab1..e192c0eb 100644
--- a/src/editor/deletebackcommond.cpp
+++ b/src/editor/deletebackcommond.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2022 - 2023 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2022-2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -29,6 +29,9 @@ void DeleteBackCommand::undo()
 {
     qDebug() << "DeleteBackCommand undo - inserting text at:" << m_insertPos
                 << ", length:" << m_delText.length();
+    if (nullptr == m_edit) {
+        return;
+    }
     m_cursor.setPosition(m_insertPos);
     m_cursor.insertText(m_delText);
 
@@ -42,6 +45,9 @@ void DeleteBackCommand::redo()
 {
     qDebug() << "DeleteBackCommand redo - deleting text at:" << m_delPos
                 << ", length:" << m_delText.length();
+    if (nullptr == m_edit) {
+        return;
+    }
     m_cursor.setPosition(m_delPos);
     m_cursor.setPosition(m_delPos + m_delText.size(), QTextCursor::KeepAnchor);
     m_cursor.deleteChar();