diff --git a/src/main/java/istlab/KisoJikken/JTAConsolePopup.java b/src/main/java/istlab/KisoJikken/JTAConsolePopup.java
index e920ef8..9894082 100644
--- a/src/main/java/istlab/KisoJikken/JTAConsolePopup.java
+++ b/src/main/java/istlab/KisoJikken/JTAConsolePopup.java
@@ -19,7 +19,7 @@
         add(mi);
         addSeparator();
 
-        if (console.getSelectedText().length() > 0) {
+        if (console.getSelectedText() != null && console.getSelectedText().length() > 0) {
             mi = new JMenuItem("Copy");
             add(mi);
             mi.addActionListener(console); // コンソールに処理してもらう
diff --git a/src/main/java/istlab/KisoJikken/MyRSJTextArea.java b/src/main/java/istlab/KisoJikken/MyRSJTextArea.java
index 4878b4d..5fdbdb1 100644
--- a/src/main/java/istlab/KisoJikken/MyRSJTextArea.java
+++ b/src/main/java/istlab/KisoJikken/MyRSJTextArea.java
@@ -3,6 +3,7 @@
 import java.awt.Color;
 import java.awt.Font;
 
+import javax.swing.JPopupMenu;
 import javax.swing.plaf.FontUIResource;
 
 import org.fife.ui.rsyntaxtextarea.RSyntaxTextArea;
@@ -50,13 +51,18 @@
         // scheme.getStyle(Token.DATA_TYPE).foreground = Color.black;
         // scheme.getStyle(Token.ERROR_CHAR).foreground = Color.black;
         // scheme.getStyle(Token.LITERAL_CHAR).foreground = Color.black;
-
-
-
   
         setHighlightCurrentLine(false); // カーソル行のハイライトを消す
         setCodeFoldingEnabled(true);
   
     }
-    
+
+    @Override
+    protected void configurePopupMenu(JPopupMenu popupMenu){
+    }
+    @Override
+    protected JPopupMenu createPopupMenu(){
+        return null;
+    }
+
 }