(JSON Parse Error) invalid type: null, expected a borrowed string at line 1 column 22

[xgshark]

I recorded a bunch of markets with flumine. About half of them have the first clk as null. bfd can process the file just fine after changing null to "null" or any other string:

{"op":"mcm","clk":null,"pt":1720183153764,"mc":[{"id":"1.230347142","marketDefinition":{"bspMarket":false,"turnInPlayEnabled":true,"persistenceEnabled":true,"marketBaseRate":5,"eventId":"33388788","eventTypeId":"1","numberOfWinners":1,"bettingType":"ODDS","marketType":"OVER_UNDER_35","marketTime":"2024-07-05T15:30:00.000Z","suspendTime":"2024-07-05T15:30:00.000Z","bspReconciled":false,"complete":true,"inPlay":false,"crossMatching":true,"runnersVoidable":false,"numberOfActiveRunners":2,"betDelay":0,"status":"OPEN","runners":[{"status":"ACTIVE","sortPriority":1,"id":1222344},{"status":"ACTIVE","sortPriority":2,"id":1222345}],"regulators":["MR_INT"],"countryCode":"LT","discountAllowed":true,"timezone":"GMT","openDate":"2024-07-05T15:30:00.000Z","version":6004374642 ...