Failed to call hook 'OnEntityTakeDamage' on plugin 'PlayerRanks v2.0.7' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.PlayerRanks.HasFriend (System.String playerId, System.String friendId) [0x0000d] in <e3431f2fc64c4635b446d7a8a1e7b694>:0 
  at Oxide.Plugins.PlayerRanks.FriendCheck (BasePlayer player, BasePlayer victim) [0x000f4] in <e3431f2fc64c4635b446d7a8a1e7b694>:0 
  at Oxide.Plugins.PlayerRanks.OnEntityTakeDamage (BaseEntity entity, HitInfo hitinfo) [0x0020f] in <e3431f2fc64c4635b446d7a8a1e7b694>:0 
  at Oxide.Plugins.PlayerRanks.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00979] in <e3431f2fc64c4635b446d7a8a1e7b694>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <d09a1f46ca2f4432811bcfe45ad13c7b>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <cf88a28c7fb44d36890d85a78331cc9d>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <cf88a28c7fb44d36890d85a78331cc9d>:0

Ooh, that's a new one.
Thanks for reporting.

Would be helpful to have someone to test - If you're willing give me a ping on Codefling discord, please.
 

[Erro] Falha ao chamar o gancho 'OnEntityTakeDamage' no plug-in 'PlayerRanks v2.0.7' (NullReferenceException: referência de objeto não definida para uma instância de um objeto)
  em Oxide.Plugins.PlayerRanks.HasFriend (System.String playerId, System.String friendId ) [0x0000d] em <65930b0f7435446180ba5a0bd620029c>: 0 
  em Oxide.Plugins.PlayerRanks.FriendCheck (player BasePlayer, vítima de BasePlayer) [0x000f4] em <65930b0f7435446180ba5a0bd620029tfoity: Base de dados: 0 
  em Oxide. 0x0020f] em <65930b0f7435446180ba5a0bd620029c>: 0 
  em Oxide.Plugins.PlayerRanks.DirectCallHook (nome do System.String, System.Object & ret, System.Object [] args) [0x00979] em <65930b0f7435806180ba5a 
  no Oxide.Plugins.CSharpPlugin.InvokeMethod (método Oxide.Core.Plugins.HookMethod, System.Object [] args) [0x00079] em <d09a1f46ca2f4432811bcfe45ad13c7b>: 0 
  no Oxide.Core.Plugins.CSPlugin.On System.Object [] args) [0x000d8] em <cf88a28c7fb44d36890d85a78331cc9d>: 0 
  em Oxide.Core.Plugins.Plugin.CallHook (gancho System.String, System.Object [] args) [0x00060] em <cf88a28c7fb78d33: 

Changed Fixed In to 2.0.8

@Rusty-Rift @Chapeleiro_
This is fixed in the latest release.
Thanks for reporting.

thx man, very good now