Uncaught exception: TypeError: Cannot convert 'node' to object
Error thrown at line 280, column 2 in remove(node):
    node.parentNode.removeChild(node);
called from line 774, column 3 in <anonymous function>(top, i):
    remove(headers[i]);
called from line 215, column 4 in forEach(elements, callback):
    callback(elements[i], i);
called from line 770, column 2 in patchSidebar():
    forEach(tops, function(top, i) {
called from line 1017, column 1 in <anonymous function>():
    patchSidebar();
called from line 10, column 0 in program code:
    (function() {