I've noticed this on http://drupalcontribstatus.com a couple times. When update_get_available() doesn't return anything, $count is 0, and division fails.

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#1 contrib_status-1295856-1.patch1.63 KBtim.plunkett
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tim.plunkett
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Primary language English
Location Philadelphia
CreditAttribution: tim.plunkett commented
Status: Active » Needs review
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contrib_status-1295856-1.patch1.63 KB

The first hunk should fix the problem by forcing update_get_available() to return something.
The second is just a failsafe to prevent division by 0, though it shouldn't really be a problem after the first fix.