Android app is crashing when value searched doest not exist in database

When I search any value that does not exist in database app crashes instantly.

code from database class

    public String ifExistIn(String stationName) {

    String query = "SELECT stationName FROM review WHERE stationId" +
            "='" + stationName + "' OR " + " stationName " + "='" + stationName + "' LIMIT 1";
    try (SQLiteDatabase database = this.getWritableDatabase();
         Cursor c = database.rawQuery(query, null)) {
        c.moveToFirst();
        return c.getString(c.getColumnIndex("stationName"));

    }

}

Code from Activity class, it adds available record to the listView

    public View.OnClickListener searchStation = new View.OnClickListener() {
    @Override
    public void onClick(View v) {

        String searchString = searchText.getText().toString();

        //String useThis = dbHelper.ifExistIn(searchString);

            if (list.contains(dbms.ifExistIn(searchString))) {
                AlertDialog.Builder builder = new AlertDialog.Builder(SearchAndReview.this);
                builder.setTitle("");
                builder.setMessage("RECORD ALREADY IN THE LIST ");
                builder.setNeutralButton("OK", null);
                builder.create().show();

            else {
                list.add(dbms.ifExistIn(searchString));
                listView.setAdapter(arrayAdapter);

            }

        } 
    }
};