Why does a "Message from Website", saying that a certain line is undefined, pop up

Shelly:)

New member
when I'm on the internet? Whenever I'm online and I'm maybe searching something on Google or my E-Mail or anything really, a box will pop up in the middle of my screen saying for example:
Line 3 of
http:// ...... is undefined
Sometimes I can click OK and go on with whatever I was doing but, other times, I click OK and the box goes away but if I click "Search" or whatever I clicked when the box came up, the box will pop up again and I can't get past that page.
Thank you!
 
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