Fatal exception handling

This is my update query,

  ContentValues value = new ContentValues();
            value.put(DBhelper.Amount, txtBudget.getText().toString());



            db = helper.getWritableDatabase();

            db.update(DBhelper.TABLE1, value," "+DBhelper.Description+"='"+value_in_tv,null);
            db.close();

            fetchData2();
            Toast.makeText(this, "Update Successfully", Toast.LENGTH_LONG).show();
            clearfield();

when click the button to update,it's giving fatal exception error.

value_in_tv this is the value I got from another class

 Bundle data_from_list= getIntent().getExtras();
        value_in_tv= data_from_list.getString("passed data key");
        txr.setText(value_in_tv);

10-18 20:45:57.812 18632-18632/com.example.username.weddingplanning E/AndroidRuntime﹕ FATAL EXCEPTION: main android.database.sqlite.SQLiteException: unrecognized token: "'suba" (code 1): , while compiling: UPDATE Category SET amount=? WHERE description='suba at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1113) at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:686) at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) at android.database.sqlite.SQLiteProgram.(SQLiteProgram.java:58) at android.database.sqlite.SQLiteStatement.(SQLiteStatement.java:31) at android.database.sqlite.SQLiteDatabase.updateWithOnConflict(SQLiteDatabase.java:1669) at android.database.sqlite.SQLiteDatabase.update(SQLiteDatabase.java:1620) at com.example.username.weddingplanning.addbudget.checkIfRowPresent(addbudget.java:134) at com.example.username.weddingplanning.addbudget.onClick(addbudget.java:114) at android.view.View.performClick(View.java:4439) at android.view.View$PerformClick.run(View.java:18398) at android.os.Handler.handleCallback(Handler.java:725) at android.os.Handler.dispatchMessage(Handler.java:92) at android.os.Looper.loop(Looper.java:176) at android.app.ActivityThread.main(ActivityThread.java:5299) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869) at dalvik.system.NativeStart.main(Native Method)