Crashes every time I start the program

I was downloading a bit of artwork through the LaunchBox program and then tried to open BigBox but encountered the following error. Haven't been able to start the program since then without it crashing before it starts

LaunchBox Version: 7.7 - beta 3 Windows Version: Windows 10 Pro How often: Every time I try to open LaunchBox or BigBox

Complete error text: " Value cannot be null. Parameter name: key

Type: System.ArgumentNullException Site: Boolean ContainsKey(TKey) Source: mscorlib 7.7-beta-3

at System.Collections.Concurrent.ConcurrentDictionary`2.ContainsKey(TKey key) at (DataManager , String ) at Unbroken.LaunchBox.Data.DataManager.LoadGames(String filePath) at (DataManager , Boolean , Boolean ) at Unbroken.LaunchBox.Data.DataManager.Load(Boolean settingsOnly, Boolean forceReloadAll) at Unbroken.LaunchBox.Data.DataManager..ctor(Boolean bare, Boolean settingsOnly) at (String[] ) at Unbroken.LaunchBox.Desktop.Program.Main(String[] args) "

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