1 files changed, 8 insertions, 0 deletions
diff --git a/src/server/game/Spells/SpellEffects.cpp b/src/server/game/Spells/SpellEffects.cpp
index 0f34ea7a553..af04f408aad 100755
--- a/src/server/game/Spells/SpellEffects.cpp
+++ b/src/server/game/Spells/SpellEffects.cpp
@@ -6933,6 +6933,14 @@ void Spell::EffectSpecCount(SpellEffIndex /*effIndex*/)
 
 void Spell::EffectActivateSpec(SpellEffIndex /*effIndex*/)
 {
+    // can't change during already started arena/battleground
+    if (Battleground const* bg = m_caster->ToPlayer()->GetBattleground())
+        if (bg->GetStatus() == STATUS_IN_PROGRESS)
+        {
+            SendCastResult(SPELL_FAILED_NOT_IN_BATTLEGROUND);
+            return;
+        }
+
     if (!unitTarget || unitTarget->GetTypeId() != TYPEID_PLAYER)
         return;