Check the class exists, to avoid fatals when composer hasn't been run.

Avoids PHP Fatals when the plugin is activated in production.

Author: dd32

plugin.php

@@ -13,9 +13,12 @@
 	require __DIR__ . '/vendor/autoload.php';
 }
 
-global $wp_parser;
-$wp_parser = new WP_Parser\Plugin();
-$wp_parser->on_load();
+// Check the class exists, to avoid fatals when composer hasn't been run.
+if ( class_exists( 'WP_Parser\Plugin' ) ) {
+	global $wp_parser;
+	$wp_parser = new WP_Parser\Plugin();
+	$wp_parser->on_load();
+}
 
 register_activation_hook( __FILE__, array( 'P2P_Storage', 'init' ) );
 register_activation_hook( __FILE__, array( 'P2P_Storage', 'install' ) );