Core/Players: fixed a possible crash when trying to send spell cooldowns for spells without a category entry

src/server/game/Entities/Player/Player.cpp

@@ -2636,7 +2636,7 @@ void Player::SendKnownSpells()
             uint32 categoryCooldown = GetSpellHistory()->GetRemainingCategoryCooldown(spellInfo);
 
             if (cooldown || categoryCooldown)
-                knownSpells.SpellHistoryEntries.push_back({ spellInfo->Id, 0, uint16(spellInfo->CategoryEntry->ID), int32(cooldown), int32(categoryCooldown) });
+                knownSpells.SpellHistoryEntries.push_back({ spellInfo->Id, 0, uint16(spellInfo->GetCategory()), int32(cooldown), int32(categoryCooldown) });
         }
     }
 

src/server/game/Spells/SpellHistory.cpp

@@ -537,6 +537,8 @@ uint32 SpellHistory::GetRemainingCooldown(SpellInfo const* spellInfo, bool withC
 
         end = catItr->second->CategoryEnd;
     }
+    else
+        return 0;
 
     Clock::time_point now = GameTime::GetGameTimeSystemPoint();
     if (end < now)