Bug 1082139 - JavascriptException: JavascriptException: TypeError: window.getComputedStyle(...) is null at: app://callscreen.gaiamobile.org/gaia_build_defer_index.js line: 146

We are not certain that this is caused by bug 548397. Instead, we should point to bug 1082139 here. There is discussion in that bug that suggests that this may be caused by bug 548397, anyways.