The Custom Action Maker works but constantly crashes

character.CUSTOM_ACTION_SET

{"id":507789,"properties":{"name":"Witch Bolt","toHitBonus":null,"description":null,"snippet":null,"isProficient":true,"isOffhand":null,"statId":4,"rangeId":2,"diceCount":1,"diceType":12,"fixedValue":0,"damageTypeId":8,"onMissDescription":null,"saveFailDescription":null,"saveSuccessDescription":null,"saveStatId":null,"fixedSaveDc":null,"actionType":2,"attackSubtype":null,"range":30,"longRange":null,"aoeType":null,"aoeSize":null,"activationTime":null,"activationType":1,"isSilvered":false,"damageBonus":null,"isMartialArts":false,"spellRangeType":null,"displayAsAttack":null}}

ActionApiError: Invalid JSON response, data object is a string at new t (https://www.dndbeyond.com/Content/1-0-541-0/React/CharacterTools/dist/characterSheet.bundle.min.js:23:48429) at Object.r [as validateResponse] (https://www.dndbeyond.com/Content/1-0-541-0/React/CharacterTools/dist/characterSheet.bundle.min.js:23:47028) at https://www.dndbeyond.com/Content/1-0-541-0/React/CharacterTools/dist/characterSheet.bundle.min.js:50:386409 at r (https://www.dndbeyond.com/Content/1-0-541-0/React/CharacterTools/dist/characterSheet.bundle.min.js:23:248603) at Generator._invoke (https://www.dndbeyond.com/Content/1-0-541-0/React/CharacterTools/dist/characterSheet.bundle.min.js:23:249723) at Generator.e.(anonymous function) [as next] (https://www.dndbeyond.com/Content/1-0-541-0/React/CharacterTools/dist/characterSheet.bundle.min.js:23:248782) at h (https://www.dndbeyond.com/Content/1-0-541-0/React/CharacterTools/dist/characterSheet.bundle.min.js:23:123723) at n (https://www.dndbeyond.com/Content/1-0-541-0/React/CharacterTools/dist/characterSheet.bundle.min.js:23:124394)