Fix fatal error in particular cases

readme.txt

@@ -5,7 +5,7 @@ Donate link: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_i
 Tags: maps, gpx, gps, graph, chart, google maps, track, garmin, image, nextgen-gallery, nextgen, exif, OpenStreetMap, OpenCycleMap, Hike&Bike, heart rate, heartrate, cadence
 Requires at least: 2.0.0
 Tested up to: 4.9.4
-Stable tag: 1.5.02
+Stable tag: 1.5.03
 
 Draws a gpx track with altitude graph. You can also display your nextgen gallery images in the map.
 
@@ -153,6 +153,8 @@ Yes!
 1. Altitude & Speed & Hearth rate
 
 == Changelog ==
+= 1.5.03 =
+* fix random error
 = 1.5.02 =
 * Security improvements
 = 1.5.01 =

wp-gpx-maps.php

@@ -3,7 +3,7 @@
 Plugin Name: WP-GPX-Maps
 Plugin URI: http://www.devfarm.it/
 Description: Draws a GPX track with altitude chart
-Version: 1.5.02
+Version: 1.5.03
 Author: Bastianon Massimo
 Author URI: http://www.devfarm.it/
 */

wp-gpx-maps_utils.php

@@ -1,5 +1,7 @@
 <?php
 
+	require_once(ABSPATH . 'wp-admin/includes/file.php');
+
 	require_once("wp-gpx-maps_utils_nggallery.php");
 
 	function wpgpxmaps_getAttachedImages($dt, $lat, $lon, $dtoffset, &$error)