System.NullReferenceException: Object reference not set to an instance of an object
at UnityEngine.WWW.CheckSecurityOnHeaders (System.String[] headers) [0x0010b] in C:\BuildAgent\work\d3d49558e4d408f4\Runtime\Export\WWW.cs:56
at UnityEngine.WWW..ctor (System.String url, System.Byte[] postData, System.Collections.Hashtable headers) [0x00018] in C:\BuildAgent\work\d3d49558e4d408f4\artifacts\EditorGenerated\Utils.cs:72
at PlayerIOClient.Internal.identifier5+identifier414.getRequest[identifier33] (Int32 method, identifier576 args) [0x00000] in <filename unknown>:0
UnityEngine.Debug:LogError(Object)
PlayerIOClient.Internal.identifier414:getRequest(Int32, identifier576)
PlayerIOClient.Internal.identifier415:MoveNext()
UnityEngine.MonoBehaviour:StartCoroutine(IEnumerator)
PlayerIOClient.Internal.identifier414:Call(Int32, identifier33, Callback`1, Callback`1)
PlayerIOClient.Internal.identifier5:SimpleGetCaptcha(String, Int32, Int32, Callback`1, Callback`1)
PlayerIOClient.Internal.identifier519:SimpleGetCaptcha(String, Int32, Int32, Callback`1, Callback`1)
SignupMenu:GetCaptcha() (at Assets/playerio/Scripts/SignupMenu.cs:249)
SignupMenu:Init() (at Assets/playerio/Scripts/SignupMenu.cs:74)
ClientManager:OnGUI() (at Assets/playerio/Scripts/ClientManager.cs:678)
Is a workaround for this in the works for the next (hopefully soon) Player.IO update?