I think this script should be placed in the header. When testing the module on IE8, scripts stopped due to other errors caused by the old browser, so the message didn't show.
I then moved the script into the header and gave it a light weight and it worked. 

drupal_add_js(drupal_get_path('module', 'bu') . '/bu.js', array('type' => 'file', 'scope' => 'header', 'every_page' => TRUE, 'weight' => -50,)); //Line 53
CommentFileSizeAuthor
#2 run_script_earlier-2373793-2.patch380 bytesDaniel.Moberly
#1 run_script_earlier-2373793-1.patch0 bytesDaniel.Moberly
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Daniel.Moberly’s picture

Daniel.Moberly CreditAttribution: Daniel.Moberly commented
Status: Active » Needs review
FileSize
run_script_earlier-2373793-1.patch0 bytes

Agreed. Attaching patch.

Daniel.Moberly’s picture

Daniel.Moberly CreditAttribution: Daniel.Moberly commented
FileSize
run_script_earlier-2373793-2.patch380 bytes

Something went wrong rolling patch. Reattaching.

Daniel.Moberly’s picture

Daniel.Moberly CreditAttribution: Daniel.Moberly commented
Status: Needs review » Fixed

Status: Fixed » Closed (fixed)

Automatically closed - issue fixed for 2 weeks with no activity.