TypeError: undefined is not iterable (cannot read property Symbol(Symbol.iterator))
    at n.value (https://cocalc.com/static/3d7a408f8885b191.js:1:41871)
    at t (https://cocalc.com/static/app-535a287f422bd182.js?57d3b056ab9963cd:5211:210623)
    at ck (https://cocalc.com/static/load-b7ab1a32e0985c47.js?57d3b056ab9963cd:33:136331)
    at https://cocalc.com/static/load-b7ab1a32e0985c47.js?57d3b056ab9963cd:33:141306
    at tL (https://cocalc.com/static/load-b7ab1a32e0985c47.js?57d3b056ab9963cd:33:29340)
    at cT (https://cocalc.com/static/load-b7ab1a32e0985c47.js?57d3b056ab9963cd:33:137564)
    at sK (https://cocalc.com/static/load-b7ab1a32e0985c47.js?57d3b056ab9963cd:33:168555)
    at sQ (https://cocalc.com/static/load-b7ab1a32e0985c47.js?57d3b056ab9963cd:33:168377)
    at HTMLDivElement.<anonymous> (https://cocalc.com/static/app-535a287f422bd182.js?57d3b056ab9963cd:5214:2812192)