Problem in expand column

Hello!
 
I created a context menu with the option to expand and collapse a particular column.
 

 flexmonster.customizeContextMenu(function(items, data, viewType) { 
     if(!data.isTotalColumn && !data.isGrandTotalColumn){
          items.push({
                  label: "Expand",
                  handler: function() {
                        flexmonster.expandData(data.hierarchy.dimensionName);
                  }
          });

          items.push({
                  label: "Collapse",
                  handler: function() {
                          flexmonster.collapseData(data.hierarchy.dimensionName);
           }
         });
     }
     return items;
 });

But when I try to expand or collapse the DSC_DIVI3 column the component hangs and the page stops responding.
I am sending CSV file with data source, and a layout image.