openlayers/openlayers — comment on commit 134f24480a9e6ebf0c71891e52a6b1d456ad1996
File: lib/OpenLayers/Popup.js line 876
By fredj:

Thanks for the report @jorix: the problem is in Popup.js line 473: `this.closeDiv.style.width` is now empty and `parseInt(this.closeDiv.style.width)` returns `NaN`.