No idea why this happens, but it happens sometimes:
Uncaught Uncaught Error: Invalid arguments(s)
Stack Trace:
Invalid arguments(s)
at dart.b (http://gridhub.club/build/web/gridhub.dart.js:1716:3)
at dart.Yx (http://gridhub.club/build/web/gridhub.dart.js:1712:47)
at VR.ej (http://gridhub.club/build/web/gridhub.dart.js:2393:37)
at dart.iP.static.Gl (http://gridhub.club/build/web/gridhub.dart.js:5402:318)
at Ba.$1 (http://gridhub.club/build/web/gridhub.dart.js:638:10)
at Q.aN (http://gridhub.club/build/web/gridhub.dart.js:745:20)
at dart.J.kH (http://gridhub.club/build/web/gridhub.dart.js:8497:35)
at yz.Ww (http://gridhub.club/build/web/gridhub.dart.js:622:3)
at PB.$0 (http://gridhub.club/build/web/gridhub.dart.js:8106:84)
at R8.Gr (http://gridhub.club/build/web/gridhub.dart.js:4009:41)
at HEa.$1 (http://gridhub.club/build/web/gridhub.dart.js:8102:32)
No idea why this happens, but it happens sometimes: