diff --git a/addressbook/inc/class.addressbook_ui.inc.php b/addressbook/inc/class.addressbook_ui.inc.php
index fb5fb4e8c4..121b52ae73 100644
--- a/addressbook/inc/class.addressbook_ui.inc.php
+++ b/addressbook/inc/class.addressbook_ui.inc.php
@@ -585,7 +585,8 @@ class addressbook_ui extends addressbook_bo
 			'hint' => 'Merge into first or account, deletes all other!',
 			'allowOnMultiple' => 'only',
 			'group' => $group,
-			'hideOnMobile' => true
+			'hideOnMobile' => true,
+			'enabled' => 'javaScript:app.addressbook.can_merge'
 		);
 		// Duplicates view
 		$actions['merge_duplicates'] = array(
diff --git a/addressbook/js/app.js b/addressbook/js/app.js
index 37fedeb9e5..0ade9e5220 100644
--- a/addressbook/js/app.js
+++ b/addressbook/js/app.js
@@ -1247,5 +1247,20 @@ app.classes.addressbook = AppJS.extend(
 		var geo_url = egw.config('geolocation_url');
 		if (geo_url) geo_url = geo_url[0];
 		return geo_url || default_url;
+	},
+
+	/**
+	 * Check to see if the selection contains at most one account
+	 *
+	 * @param {egwAction} action
+	 * @param {egwActionObject[]} selected Selected rows
+	 */
+	can_merge: function(action, selected)
+	{
+		return selected.filter(function (row) {
+			var data = egw.dataGetUIDdata(row.id);
+			return data && data.data.account_id;
+		}).length <= 1;
 	}
+
 });