diff --git a/RedPandaIDE/main.cpp b/RedPandaIDE/main.cpp
index b60714df..7898d191 100644
--- a/RedPandaIDE/main.cpp
+++ b/RedPandaIDE/main.cpp
@@ -405,7 +405,8 @@ int main(int argc, char *argv[])
                                   e.reason(),
                                   QMessageBox::Ok);
         }
-        // qDebug()<<"Load font"<<QFontDatabase::addApplicationFont(":/fonts/asciicontrol.ttf");
+        // qDebug()<<"Load font";
+        QFontDatabase::addApplicationFont(":/fonts/asciicontrol.ttf");
 
         MainWindow mainWindow;
         pMainWindow = &mainWindow;
diff --git a/RedPandaIDE/settingsdialog/editorfontwidget.cpp b/RedPandaIDE/settingsdialog/editorfontwidget.cpp
index ced4bda2..69608373 100644
--- a/RedPandaIDE/settingsdialog/editorfontwidget.cpp
+++ b/RedPandaIDE/settingsdialog/editorfontwidget.cpp
@@ -24,6 +24,8 @@ EditorFontWidget::EditorFontWidget(const QString& name, const QString& group, QW
     ui(new Ui::EditorFontWidget)
 {
     ui->setupUi(this);
+    ui->cbFallbackFont2->setEnabled(false);
+    ui->cbFallbackFont3->setEnabled(false);
     connect(ui->chkFallbackFont2, &QCheckBox::stateChanged,
             this, &EditorFontWidget::onFallbackFontsCheckStateChanged);
     connect(ui->chkFallbackFont3, &QCheckBox::stateChanged,
diff --git a/libs/qsynedit/qsynedit/document.cpp b/libs/qsynedit/qsynedit/document.cpp
index d5acbfb3..8dc06e09 100644
--- a/libs/qsynedit/qsynedit/document.cpp
+++ b/libs/qsynedit/qsynedit/document.cpp
@@ -30,7 +30,7 @@
 
 namespace QSynedit {
 
-Document::Document(const QFont& font, const QFont& nonAsciiFont, QObject *parent):
+Document::Document(const QFont& font, QObject *parent):
       QObject(parent),
       mFontMetrics(font),
       mTabSize(4),
@@ -669,8 +669,8 @@ void Document::loadFromFile(const QString& filename, const QByteArray& encoding,
             } else if (line.endsWith("\n")){
                 line.remove(line.length()-1,1);
             }
-            // if (isBinaryContent(line))
-            //     throw BinaryFileError(tr("'%1' is a binaray File!").arg(filename));
+            if (isBinaryContent(line))
+                throw BinaryFileError(tr("'%1' is a binaray File!").arg(filename));
             if (allAscii) {
                 allAscii = isTextAllAscii(line);
             }
diff --git a/libs/qsynedit/qsynedit/document.h b/libs/qsynedit/qsynedit/document.h
index 4945b7d6..5b8cf014 100644
--- a/libs/qsynedit/qsynedit/document.h
+++ b/libs/qsynedit/qsynedit/document.h
@@ -210,7 +210,7 @@ class Document : public QObject
 {  
     Q_OBJECT
 public:
-    explicit Document(const QFont& font, const QFont& nonAsciiFont, QObject* parent=nullptr);
+    explicit Document(const QFont& font, QObject* parent=nullptr);
     Document(const Document&)=delete;
     Document& operator=(const Document&)=delete;
 
diff --git a/libs/qsynedit/qsynedit/qsynedit.cpp b/libs/qsynedit/qsynedit/qsynedit.cpp
index 93d80c37..71e50cca 100644
--- a/libs/qsynedit/qsynedit/qsynedit.cpp
+++ b/libs/qsynedit/qsynedit/qsynedit.cpp
@@ -58,7 +58,7 @@ QSynEdit::QSynEdit(QWidget *parent) : QAbstractScrollArea(parent),
     mPainting = false;
     mFontDummy = QFont("monospace",14);
     mFontDummy.setStyleStrategy(QFont::PreferAntialias);
-    mDocument = std::make_shared<Document>(mFontDummy, mFontDummy, this);
+    mDocument = std::make_shared<Document>(mFontDummy, this);
     //fPlugins := TList.Create;
     mMouseMoved = false;
     mMouseOrigin = QPoint(0,0);
diff --git a/libs/redpanda_qt_utils/qt_utils/utils.cpp b/libs/redpanda_qt_utils/qt_utils/utils.cpp
index 12839677..261d5b19 100644
--- a/libs/redpanda_qt_utils/qt_utils/utils.cpp
+++ b/libs/redpanda_qt_utils/qt_utils/utils.cpp
@@ -724,15 +724,15 @@ QStringList absolutePaths(const QString &dirPath, const QStringList &relativePat
     return list;
 }
 
-// bool isBinaryContent(const QByteArray &text)
-// {
-//     for (char c:text) {
-//         if (c>=0 && c<' ' && c!='\t' && c!='\n' && c!='\r') {
-//             return true;
-//         }
-//     }
-//     return false;
-// }
+bool isBinaryContent(const QByteArray &text)
+{
+    for (char c:text) {
+        if (c==0) {
+            return true;
+        }
+    }
+    return false;
+}
 
 void clearQPlainTextEditFormat(QTextEdit *editor)
 {