Cannot add columns to MaterialDataTable. Throws UmbrellaException TypeError.

Hello. 

I'm having an issue with MaterialDataTable (using rc2). It always crashes with: Cannot read property 'insert_37_g$' of undefined. This happens when I try to add a column like table.addColumn(new TextColumn<ContactInfo>() { ... }, "Column");. 

Does anybody know why this is happening ? 

Thanks in advance

MaterialPanel panel = new MaterialPanel();

MaterialLabel title = new MaterialLabel("Contact Information");

title.setTextColor(Color.BLUE);

title.setTextAlign(TextAlign.CENTER);

title.setFontSize("36px");

title.setFontWeight(FontWeight.BOLD);

panel.add(title);

panel.add(new Hr());

MaterialDataTable<ContactInfo> table = new MaterialDataTable<ContactInfo>();

table.setHeight("90%");

table.setUseStickyHeader(true);

table.setUseCategories(false);

table.setUseRowExpansion(false);

table.setSelectionType(SelectionType.NONE);

table.setRedraw(true);

// ... If removing table.addColumn(...) and adding to panel at this point it works, an empty table appears.

table.addColumn(new TextColumn<ContactInfo>() { // The point where exception is thrown.

@Override

public String getHeaderWidth() {

return "20%";

}

@Override

public Comparator<? super RowComponent<ContactInfo>> getSortComparator() {

return (o1, o2) -> o1.getData().getFamilyName().compareTo(o2.getData().getFamilyName());

}

@Override

public String getValue(ContactInfo object) {

return object.getFamilyName();

}

}, "Family Name");

// ...

panel.add(table);

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