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diff --git a/www/wiki/includes/interwiki/NullInterwikiLookup.php b/www/wiki/includes/interwiki/NullInterwikiLookup.php
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+++ b/www/wiki/includes/interwiki/NullInterwikiLookup.php
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+<?php
+/**
+ * Copyright (C) 2018 Kunal Mehta <legoktm@member.fsf.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+namespace MediaWiki\Interwiki;
+
+/**
+ * An interwiki lookup that has no data, intended
+ * for use in the installer.
+ *
+ * @since 1.31
+ */
+class NullInterwikiLookup implements InterwikiLookup {
+
+	/**
+	 * @inheritDoc
+	 */
+	public function isValidInterwiki( $prefix ) {
+		return false;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function fetch( $prefix ) {
+		return false;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function getAllPrefixes( $local = null ) {
+		return [];
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function invalidateCache( $prefix ) {
+	}
+}