src/main/java/com/bazaarvoice/jless/ast/node/SelectorNode.java
@Override
    protected void cloneChildren(InternalNode node) {
        SelectorNode selector = (SelectorNode) node;

        // Reset internal state
        selector.setAdditionVisitor();

        super.cloneChildren(node);
    }
@Override
    protected void cloneChildren(InternalNode node) {
        SelectorNode selector = (SelectorNode) node;

        // Reset internal state
        selector.setAdditionVisitor();

        super.cloneChildren(node);
    }
Recreate internal state before children are cloned.