[Plugin: 1-click Retweet/Share/Like] Error message on upgrading 1-Click Retweet plug-in

After updaing to version 4.7 I am getting this error message displayed across the top of the dashboard:

Warning: array_key_exists() [function.array-key-exists]: The second argument should be either an array or an object in /home/russellp/public_html/NF/wp-content/plugins/1-click-retweetsharelike/la-click-and-share-networkpub.php on line 20

https://www.ads-software.com/extend/plugins/1-click-retweetsharelike/