Gnome Shell 3.2 this._activityEntry is undefined

Created by: faceleg

    JS ERROR: !!!   Exception was: TypeError: this._activityEntry is undefined
    JS ERROR: !!!     lineNumber = '277'
    JS ERROR: !!!     fileName = '"/usr/share/gnome-shell/extensions/hamster@gnome.org/extension.js"'
    JS ERROR: !!!     stack = '"([object Array],null)@/usr/share/gnome-shell/extensions/hamster@gnome.org/extension.js:277"'
     JS ERROR: !!!     message = '"this._activityEntry is undefined"'