Good Plugin, but it has bugs

I like this plugin for its auto-linking feature very much, particularly because we can associate multiple words easily to a single link. However, if we turn on debug mode and warnings in WordPress, we come across the following warning when this plugin is active:
/home2/ddarcom/domains/d-dar.com/public_html/wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker.php on line 13 Deprecated: Array and string offset
access syntax with curly braces is deprecated in /home2/ddarcom/domains/d-dar.com/public_html/wp-content/plugins/wpa-seo-auto-linker/wpa-seo-auto-linker-functions.php
on line 18