[Opera 12] responsive menu can't be closed

Created by: ixti

Steps to reproduce

• Open http://twitter.github.com/bootstrap/base-css.html in Opera 12
• Make browse window small to see the responsive menu
• Click the menu button
• Click the menu button again

Expected

Responsive menu should hide away.

Actual result

Responsive menu stays on the page always opened.

Additionally

Looks like the first click on the menu throws an unhandled exception (fired from inside of Sizzle), which stops any further JS execution, unless you explicitly click continue in the developer console.