The Elder Scrolls Online v5.1.9 fixes the issue with Imperial City daily quests not dropping the proper rewards during the Imperial City Celebration, a blocking issue with Elsweyr World Boss dailies, and two game crashes. The size of this patch is approximately 106MB.
World Boss Dailies
Sword of the Serpent: Fixed an issue where very remote players could become blocked if their groupmates pilfered challenger mementos before the remote player was in range to receive the quest item.
General
Fixed an issue preventing daily quests in Imperial City from granting rewards during the Imperial City Celebration.
General
Fixed an issue where your game could crash after logging out while in combat with certain monsters.
Fixed an issue where a large number of a specific characters appearing in chat could cause the client to become unresponsive.