diff --git a/NEWS.md b/NEWS.md
index ff7a17a1..4eb01522 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -26,6 +26,7 @@ Red Panda C++ Version 2.24
   - fix: When opening multiple files, only the active file should be parsed.
   - fix: Wrong compiler settings if xcode is not installed in mac os.
   - enhancement: Name for new files will not be different from files openned.
+  - fix: Crash if close file while auto syntax checking.
 
 Red Panda C++ Version 2.23
 
diff --git a/RedPandaIDE/compiler/compiler.cpp b/RedPandaIDE/compiler/compiler.cpp
index ea256097..770cefef 100644
--- a/RedPandaIDE/compiler/compiler.cpp
+++ b/RedPandaIDE/compiler/compiler.cpp
@@ -323,7 +323,7 @@ QString Compiler::getCharsetArgument(const QByteArray& encoding,FileType fileTyp
     // test if force utf8 from autolink infos
     if ((fileType == FileType::CSource ||
             fileType == FileType::CppSource) && pSettings->editor().enableAutolink() ){
-        Editor* editor = pMainWindow->editorList()->getEditor();
+        Editor* editor = pMainWindow->editorList()->getOpenedEditorByFilename(mFilename);
         if (editor) {
             PCppParser parser = editor->parser();
             if (parser) {
@@ -340,7 +340,7 @@ QString Compiler::getCharsetArgument(const QByteArray& encoding,FileType fileTyp
                 }
                 QSet<QString> parsedFiles;
                 forceExecUTF8 = parseForceUTF8ForAutolink(
-                            editor->filename(),
+                            mFilename,
                             parsedFiles,
                             parser);
             }
diff --git a/RedPandaIDE/editor.cpp b/RedPandaIDE/editor.cpp
index 4da3faec..ae79c467 100644
--- a/RedPandaIDE/editor.cpp
+++ b/RedPandaIDE/editor.cpp
@@ -192,6 +192,7 @@ Editor::Editor(QWidget *parent, const QString& filename,
 
     mStatementColors = pMainWindow->statementColors();
     if (mParentPageControl) {
+        //first showEvent triggered here
         mParentPageControl->addTab(this,"");
         updateCaption();
     }
@@ -217,12 +218,13 @@ Editor::Editor(QWidget *parent, const QString& filename,
             this, &Editor::onScrollBarValueChanged);
     mInited=true;
 
-//    if (!pMainWindow->openingFiles()
-//            && !pMainWindow->openingProject()) {
-//        reparse(false);
-//        checkSyntaxInBack();
-//        reparseTodo();
-//    }
+    //show event is trigged when this is added to the qtabwidget
+    if (!pMainWindow->openingFiles()
+            && !pMainWindow->openingProject()) {
+        reparse(false);
+        checkSyntaxInBack();
+        reparseTodo();
+    }
 }
 
 Editor::~Editor() {
@@ -3106,7 +3108,7 @@ void Editor::reparse(bool resetParser)
         return;
     if (!mParser->enabled())
         return;
-
+    //qDebug()<<"reparse "<<mFilename;
     //mParser->setEnabled(pSettings->codeCompletion().enabled());
     ParserLanguage language = mUseCppSyntax?ParserLanguage::CPlusPlus:ParserLanguage::C;
     if (!inProject()) {
diff --git a/RedPandaIDE/parser/cppparser.cpp b/RedPandaIDE/parser/cppparser.cpp
index 33adb253..f15b0223 100644
--- a/RedPandaIDE/parser/cppparser.cpp
+++ b/RedPandaIDE/parser/cppparser.cpp
@@ -66,6 +66,7 @@ CppParser::CppParser(QObject *parent) : QObject(parent)
 
 CppParser::~CppParser()
 {
+    //qDebug()<<"delete parser";
     while (true) {
         //wait for all methods finishes running
         {
@@ -75,6 +76,7 @@ CppParser::~CppParser()
               break;
             }
         }
+        //qDebug()<<"waiting for parse finished";
         QThread::msleep(50);
         QCoreApplication* app = QApplication::instance();
         app->processEvents();