Add the following snippet as a workaround -
Ext.override(Ext.Element, {
findParent : function(simpleSelector, maxDepth, returnEl){
var p = this.dom, b = document.body, depth = 0, dq = Ext.DomQuery, stopEl;
maxDepth = maxDepth || 50;
if(typeof maxDepth != "number"){
stopEl = Ext.getDom(maxDepth);
maxDepth = 10;
}
try {
while(p && p.nodeType == 1 && depth < maxDepth && p != b && p != stopEl){
if(dq.is(p, simpleSelector)){
return returnEl ? Ext.get(p) : p;
}
depth++;
p = p.parentNode;
}
} catch(e) {};
return null;
}
});
JavaScript