Conflict with CiviCRM

The last update seems to have introduced an issue with the $redirection global variable, which is causing problems with one of our client’s CiviCRM installation.

To fix this, one of the developers on my team made changes to /wp-content/plugins/redirection/modules/wordpress.php

The changes made were: added two if(isset($redirection)) lines (and the closing curly braces).

function init() {
		global $redirection;

		$url = $_SERVER['REQUEST_URI'];

		// Make sure we don't try and redirect something essential
		if(isset($redirection)){
			if ( !$this->protected_url( $url ) && !$redirection->hasMatched() ) {
				do_action( 'redirection_first', $url, $this );

				$redirects = Red_Item::get_for_url( $url, 'wp' );

				foreach ( (array)$redirects AS $item ) {
					if ( $item->matches( $url ) ) {
						$redirection->setMatched( true );
						$this->matched = $item;
						break;
					}
				}

				do_action( 'redirection_last', $url, $this );
			}
		}
	}

	function protected_url( $url )
	{
		global $redirection;
		$part = explode( '?', $url );
		if(isset($redirection)){
			if ( $part[0] == str_replace( get_bloginfo( 'url' ), '', $redirection->url() ).'/ajax.php' || strpos($url, 'wp-cron.php' ) !== false )
				return true;
		}
		return false;
	}

My concern of-course is that when we do the next update of the plugin, the issue will be re-introduced, if not resolved at the plugin core level.

https://wordpress.org/plugins/redirection/