Invalid Permissions file cause exception #51

An error occured while executing p [reload]: System.NullReferenceException: Object reference not set to an instance of an object
  at Rocket.Core.Permissions.RocketPermissionsManager.HasPermission (Rocket.API.IRocketPlayer player, System.Collections.Generic.List`1[T] permissions) [0x00000] in <2b8ee4b602174810b7294320f1aecbc4>:0 
  at Rocket.API.IRocketPermissionsProviderExtensions.HasPermission (Rocket.API.IRocketPermissionsProvider rocketPermissionProvider, Rocket.API.IRocketPlayer player, System.String permission) [0x0000e] in <dc29ebecb51045f78222d0d1b7c35be1>:0 
  at Rocket.API.IRocketPlayerExtension.HasPermission (Rocket.API.IRocketPlayer player, System.String permission) [0x00000] in <2b8ee4b602174810b7294320f1aecbc4>:0 
  at Rocket.Unturned.Commands.CommandP.Execute (Rocket.API.IRocketPlayer caller, System.String[] command) [0x0001a] in <6eb2810103134c78ad34dadb335a4f18>:0 
  at Rocket.Core.Commands.RocketCommandManager+RegisteredRocketCommand.Execute (Rocket.API.IRocketPlayer caller, System.String[] command) [0x00000] in <2b8ee4b602174810b7294320f1aecbc4>:0 
  at Rocket.Core.Commands.RocketCommandManager.Execute (Rocket.API.IRocketPlayer player, System.String command) [0x00176] in <2b8ee4b602174810b7294320f1aecbc4>:0