Android NullPointerException + GetDatabaseLocked

I have got a problem with my programm. I use a database to save the settings of my app. When I save the password in the app it´s all ok, but when I save the name of a "school class" with in principle the same method, but another table it crashes and I have got this error: ``` 02-19 15:32:04.070: E/AndroidRuntime(14349): FATAL EXCEPTION: main 02-19 15:32:04.070: E/AndroidRuntime(14349): java.lang.NullPointerException 02-19 15:32:04.070: E/AndroidRuntime(14349): at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:224) 02-19 15:32:04.070: E/AndroidRuntime(14349): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164) 02-19 15:32:04.070: E/AndroidRuntime(14349): at de.vertretungsplan2.helper.DBHandler.insertKurs(DBHandler.java:95) 02-19 15:32:04.070: E/AndroidRuntime(14349): at de.vertretungsplan2.tabswipe.adapter.KurseFragment$1.onItemClick(KurseFragment.java:38) 02-19 15:32:04.070: E/AndroidRuntime(14349): at android.widget.AdapterView.performItemClick(AdapterView.java:297) 02-19 15:32:04.070: E/AndroidRuntime(14349): at android.widget.AbsListView.performItemClick(AbsListView.java:1100) 02-19 15:32:04.070: E/AndroidRuntime(14349): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2788) 02-19 15:32:04.070: E/AndroidRuntime(14349): at android.widget.AbsListView$1.run(AbsListView.java:3463) 02-19 15:32:04.070: E/AndroidRuntime(14349): at android.os.Handler.handleCallback(Handler.java:730) 02-19 15:32:04.070: E/AndroidRuntime(14349): at android.os.Handler.dispatchMessage(Handler.java:92) 02-19 15:32:04.070: E/AndroidRuntime(14349): at android.os.Looper.loop(Looper.java:137) 02-19 15:32:04.070: E/AndroidRuntime(14349): at android.app.ActivityThread.main(ActivityThread.java:5289) 02-19 15:32:04.070: E/AndroidRuntime(14349): at java.lang.reflect.Method.invokeNative(Native Method) 02-19 15:32:04.070: E/AndroidRuntime(14349): at java.lang.reflect.Method.invoke(Method.java:525) 02-19 15:32:04.070: E/AndroidRuntime(14349): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739) 02-19 15:32:04.070: E/AndroidRuntime(14349): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555) 02-19 15:32:04.070: E/AndroidRuntime(14349): at dalvik.system.NativeStart.main(Native Method) ``` This is the Method that should write in the database: ``` public void insertKurs(String Kurs){ long rowId = -1; try{ //open Database SQLiteDatabase db = this.getWritableDatabase(); //Content ContentValues values = new ContentValues(); values.put(KURS_NAME, Kurs); //insert Values in Table rowId = db.insert(TABLE_NAME_KURS, null, values); db.close(); }catch (SQLiteException e){ Log.e(TAG,"insert()",e); }finally{ Log.d(TAG, "insert(): rowId=" + rowId); } } ``` This Method work without any Problems: ``` public void insertPW(String PW){ SQLiteDatabase db = null; long rowId = -1; try{ //open Database db = this.getWritableDatabase(); //Content ContentValues values = new ContentValues(); values.put(PASSWORD_NAME, PW); //insert Values in Table rowId = db.insert(TABLE_NAME_PW, null, values); db.close(); }catch (SQLiteException e){ Log.e(TAG,"insert()",e); }finally{ Log.d(TAG, "insert(): rowId=" + rowId); } } ``` This is the method that call the other: ``` public void onItemClick(AdapterView<?>arg0,View v, int position,long id){ db.insertKurs(kursView1.getItemAtPosition(position).toString()); } }); ``` Thank you for the help and sorry for my english :D