NullReferenceException at TryMigrateDataSolved

I am receiving this error for only 1 player, the rest work fine.

Can someone point me in the right direction? thanks!

[4/28/2019 12:18:38 PM] Failed to run a 0.10 timer in 'Backpacks v3.0.2' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.Backpacks.TryMigrateData (System.String fileName) [0x0001f] in <946be7444bb24036834a7efa0526f745>:0
  at Oxide.Plugins.Backpacks+Backpack.Get (System.UInt64 id) [0x00041] in <946be7444bb24036834a7efa0526f745>:0
  at Oxide.Plugins.Backpacks+<OpenBackpackConsoleCommand>c__AnonStorey4.<>m__0 () [0x00000] in <946be7444bb24036834a7efa0526f745>:0
  at Oxide.Core.Libraries.Timer+TimerInstance.FireCallback () [0x00018] in <4452f821def6406d834e4149849fe7ea>:0
Can you send me that players backpack file please, if you can figure out whose it is.
In response to LaserHydra ():
Can you send me that players backpack file please, if you can figure out whose it is.
Sorry, I was able to find it using the JSON editor.  There was a space where there shouldn't be.  I appreciate your response.
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