diff --git a/NEWS.md b/NEWS.md
index 832133a0..a330843f 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,6 @@
+Version 0.2.1
+ - fix: crash when load last opens
+
 Version 0.2
  - fix : header file completion stop work when input '.'
  - change: continue to run / debug if there are compiling warnings (but no errors)
diff --git a/RedPandaIDE/compiler/projectcompiler.cpp b/RedPandaIDE/compiler/projectcompiler.cpp
index ecb0a281..123bf4e3 100644
--- a/RedPandaIDE/compiler/projectcompiler.cpp
+++ b/RedPandaIDE/compiler/projectcompiler.cpp
@@ -376,7 +376,7 @@ void ProjectCompiler::writeMakeObjFilesRules(QFile &file)
             foreach(const PProjectUnit& unit, mProject->units()) {
                 if (getFileType(unit->fileName())!=FileType::WindowsResourceSource)
                     continue;
-                if (QFile(unit->fileName()).exists()) {
+                if (fileExists(unit->fileName())) {
                     QString ResFile = extractRelativePath(mProject->makeFileName(), unit->fileName());
                     ResFiles = ResFiles + genMakePath2(ResFile) + ' ';
                 }
diff --git a/RedPandaIDE/editor.cpp b/RedPandaIDE/editor.cpp
index 9e36ebf5..c554fca9 100644
--- a/RedPandaIDE/editor.cpp
+++ b/RedPandaIDE/editor.cpp
@@ -110,7 +110,7 @@ Editor::Editor(QWidget *parent, const QString& filename,
     }
 
     if (pSettings->editor().readOnlySytemHeader()
-            && (mParser->isSystemHeaderFile(filename) || mParser->isProjectHeaderFile(filename))) {
+            && (mParser->isSystemHeaderFile(mFilename) || mParser->isProjectHeaderFile(mFilename))) {
         this->setModified(false);
         setReadOnly(true);
         updateCaption();
@@ -316,6 +316,11 @@ bool Editor::saveAs(const QString &name, bool fromProject){
     if (pSettings->editor().syntaxCheckWhenSave())
         pMainWindow->checkSyntaxInBack(this);
 
+    if (pSettings->editor().readOnlySytemHeader()
+            && (!mParser->isSystemHeaderFile(mFilename) && !mParser->isProjectHeaderFile(mFilename))) {
+        setReadOnly(false);
+        updateCaption();
+    }
     return true;
 }
 
@@ -681,8 +686,8 @@ void Editor::onPreparePaintHighlightToken(int line, int aChar, const QString &to
     //selection
     if (selAvail() && highlighter()) {
         if ((
-          (attr->name() == SYNS_AttrIdentifier)
-          || (attr->name() == SYNS_AttrReservedWord)
+          (attr == highlighter()->identifierAttribute())
+          || (attr == highlighter()->keywordAttribute())
           || (attr->name() == SYNS_AttrPreprocessor)
           )
           && (token == mSelectionWord)) {
@@ -694,7 +699,7 @@ void Editor::onPreparePaintHighlightToken(int line, int aChar, const QString &to
 
 
 //    qDebug()<<token<<"-"<<attr->name()<<" - "<<line<<" : "<<aChar;
-    if (mParser && mCompletionPopup && (attr->name() == SYNS_AttrIdentifier)) {
+    if (mParser && mCompletionPopup && (attr == highlighter()->identifierAttribute())) {
         BufferCoord p{aChar,line};
         BufferCoord pBeginPos,pEndPos;
         QString s= getWordAtPosition(this,p, pBeginPos,pEndPos, WordPurpose::wpInformation);
@@ -2125,7 +2130,7 @@ Editor::TipType Editor::getTipType(QPoint point, BufferCoord& pos)
                     // do not allow when dragging selection
                     if (isPointInSelection(pos))
                         return TipType::Selection;
-                } else if (attr->name() == SYNS_AttrIdentifier)
+                } else if (attr == highlighter()->identifierAttribute())
                     return TipType::Identifier;
                 else if (attr->name() == SYNS_AttrPreprocessor)
                     return TipType::Preprocessor;
@@ -2388,7 +2393,7 @@ void Editor::updateFunctionTip()
        pMainWindow->functionTip()->hide();
        return;
     }
-    if (HLAttr->name()!=SYNS_AttrIdentifier) {
+    if (HLAttr != highlighter()->identifierAttribute()) {
         pMainWindow->functionTip()->hide();
         return;
     }
diff --git a/RedPandaIDE/editorlist.cpp b/RedPandaIDE/editorlist.cpp
index d8d47023..4a8e2234 100644
--- a/RedPandaIDE/editorlist.cpp
+++ b/RedPandaIDE/editorlist.cpp
@@ -29,7 +29,7 @@ Editor* EditorList::newEditor(const QString& filename, const QByteArray& encodin
         parentPageControl = getNewEditorPageControl();
     else
         parentPageControl = page;
-    if (!filename.isEmpty() && QFile(filename).exists()) {
+    if (fileExists(filename)) {
         pMainWindow->fileSystemWatcher()->addPath(filename);
     }
     Editor * e = new Editor(parentPageControl,filename,encoding,inProject,newFile,parentPageControl);
@@ -255,6 +255,8 @@ void EditorList::forceCloseEditor(Editor *editor)
 
 Editor* EditorList::getOpenedEditorByFilename(const QString &filename)
 {
+    if (filename.isEmpty())
+        return nullptr;
     QFileInfo fileInfo(filename);
     QString fullname = fileInfo.absoluteFilePath();
     for (int i=0;i<mLeftPageWidget->count();i++) {
@@ -274,6 +276,8 @@ Editor* EditorList::getOpenedEditorByFilename(const QString &filename)
 
 Editor *EditorList::getEditorByFilename(const QString &filename)
 {
+    if (filename.isEmpty())
+        return nullptr;
     //check if an editor is already openned
     Editor* e=getOpenedEditorByFilename(filename);
     if (e!=nullptr)
diff --git a/RedPandaIDE/mainwindow.cpp b/RedPandaIDE/mainwindow.cpp
index 10cb82de..e2169f43 100644
--- a/RedPandaIDE/mainwindow.cpp
+++ b/RedPandaIDE/mainwindow.cpp
@@ -1536,7 +1536,7 @@ void MainWindow::loadLastOpens()
         updateEditorActions();
         updateForEncodingInfo();
     }
-    if (!focusedEditor)
+    if (focusedEditor)
         focusedEditor->activate();
 }
 
diff --git a/RedPandaIDE/parser/parserutils.cpp b/RedPandaIDE/parser/parserutils.cpp
index c2795e1f..5e599b7a 100644
--- a/RedPandaIDE/parser/parserutils.cpp
+++ b/RedPandaIDE/parser/parserutils.cpp
@@ -356,6 +356,8 @@ QString getSystemHeaderFilename(const QString &fileName, const QSet<QString>& in
 
 bool isSystemHeaderFile(const QString &fileName, const QSet<QString> &includePaths)
 {
+    if (fileName.isEmpty())
+        return false;
     if (includePaths.isEmpty())
         return false;
     bool isFullName = false;
diff --git a/RedPandaIDE/utils.cpp b/RedPandaIDE/utils.cpp
index 205817a0..a0c592fd 100644
--- a/RedPandaIDE/utils.cpp
+++ b/RedPandaIDE/utils.cpp
@@ -135,6 +135,8 @@ bool isNonPrintableAsciiChar(char ch)
 
 bool fileExists(const QString &file)
 {
+    if (file.isEmpty())
+        return false;
     return QFile(file).exists();
 }
 
@@ -148,6 +150,8 @@ bool fileExists(const QString &dir, const QString &fileName)
 
 bool directoryExists(const QString &file)
 {
+    if (file.isEmpty())
+        return false;
    QFileInfo dir(file);
    return dir.exists() && dir.isDir();
 }