Jetpack and iPhone

I get this PHP Warning on iPhone when Jetpack is activated: “PHP Warning: stripos() [function.strip os]:needle is not a string or an integer in
C:\Data\Websites\bobvine.gen.nz\www\Blog\wp-includes\functions.php on line 658″ plus similar for line 661.
On advice from WordPress Support that the php error is likely being caused either by a problem with my blog’s theme, or a plugin installed on my blog, I found that the situation is corrected when Jetpack is deactivated. Jetpack therefore to have been isolated as the problem.
Please assist me by letting me know the solution to allow me to use my iPhone through Safari to access my website.

http://wordpress.org/extend/plugins/jetpack/