I am having an issue that is making me pull my hair out! lol

History... upgrading a 1.5.0 cart to 1.5.4
Installed latest "combo" version of SBA from github and get an error in logs as follows when going to a product page - which is blank:

[20-Aug-2016 13:21:11 America/New_York] PHP Parse error: syntax error, unexpected '[' in /home/elkkidsc/public_html/store2/includes/classes/observers/class.products_with_attributes_stock.php on line 671

When I look at it in Dreamweaver it shows two lines as "red" indicating an error:
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