From 5d6f0d64015fc83fadd890db950af4c7b1e6e40c Mon Sep 17 00:00:00 2001
From: hondacrx <prelude_20032002@yahoo.com>
Date: Sun, 13 Dec 2020 18:16:04 -0500
Subject: [PATCH] Core/PacketIO: Fixed client crashes with
 SMSG_UPDATE_TALENT_DATA

Port From (https://github.com/TrinityCore/TrinityCore/commit/a50f671afd0c17b768aa1dd73d3d63476ff5523c)
---
 Source/Game/Entities/Player/Player.Talents.cs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Source/Game/Entities/Player/Player.Talents.cs b/Source/Game/Entities/Player/Player.Talents.cs
index 76528cf92..2569e7e14 100644
--- a/Source/Game/Entities/Player/Player.Talents.cs
+++ b/Source/Game/Entities/Player/Player.Talents.cs
@@ -549,7 +549,6 @@ namespace Game.Entities
         {
             UpdateTalentData packet = new UpdateTalentData();
             packet.Info.PrimarySpecialization = GetPrimarySpecialization();
-            packet.Info.ActiveGroup = GetActiveTalentGroup();
 
             for (byte i = 0; i < PlayerConst.MaxSpecializations; ++i)
             {
@@ -607,7 +606,11 @@ namespace Game.Entities
                     groupInfoPkt.PvPTalentIDs.Add((ushort)pvpTalents[slot]);
                 }
 
-                packet.Info.TalentGroups.Add(groupInfoPkt);
+                if (i == GetActiveTalentGroup())
+                    packet.Info.ActiveGroup = (byte)packet.Info.TalentGroups.Count;
+
+                if (!groupInfoPkt.TalentIDs.Empty() || !groupInfoPkt.PvPTalentIDs.Empty() || i == GetActiveTalentGroup())
+                    packet.Info.TalentGroups.Add(groupInfoPkt);
             }
 
             SendPacket(packet);