diff --git a/NEWS.md b/NEWS.md
index 157a7e0c..d411ab7f 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -5,6 +5,7 @@ Red Panda C++ Version 1.0.8
   - enhancement: add compiler commandline argument for "-E" (only preprocessing)
   - enhancement: auto set output suffix to ".expanded.cpp" when compiler commandline argument for "-E" is turned on
   - enhancement: auto set output suffix to ".s" when compiler commandline argument for "-S" is turned on
+  - enhancement: show error message when user set a shortcut that's already being used.
 
 Red Panda C++ Version 1.0.7
   - change: use Shift+Enter to break line
diff --git a/RedPandaIDE/settingsdialog/environmentshortcutwidget.cpp b/RedPandaIDE/settingsdialog/environmentshortcutwidget.cpp
index a2a12d26..c3b65fd8 100644
--- a/RedPandaIDE/settingsdialog/environmentshortcutwidget.cpp
+++ b/RedPandaIDE/settingsdialog/environmentshortcutwidget.cpp
@@ -19,6 +19,7 @@
 #include "../mainwindow.h"
 #include "../widgets/shortcutinputedit.h"
 #include <QMenuBar>
+#include <QMessageBox>
 
 EnvironmentShortcutWidget::EnvironmentShortcutWidget(const QString& name, const QString& group, QWidget *parent) :
     SettingsWidget(name,group,parent),
@@ -119,6 +120,17 @@ bool EnvironmentShortcutModel::setData(const QModelIndex &index, const QVariant
         PEnvironmentShortcut item = mShortcuts[index.row()];
         QString s = value.toString().trimmed();
         if (s!=item->shortcut) {
+            for (int i=0;i<mShortcuts.length();i++) {
+                if (i==index.row())
+                    continue;
+                if (s==mShortcuts[i]->shortcut)  {
+                    QMessageBox::critical(nullptr,
+                                          tr("Error"),
+                                          tr("Shortcut \"%1\" is used by \"%2\".")
+                                          .arg(s,mShortcuts[i]->fullPath));
+                    return false;
+                }
+            }
             item->shortcut = value.toString();
             emit shortcutChanged();
         }