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  1. Minecraft: Java Edition
  2. MC-82945

UUID error: Tried to add entity with duplicate UUID spam

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    • Icon: Bug Bug
    • Resolution: Fixed
    • Minecraft 15w33a
    • Minecraft 15w31a, Minecraft 15w31c, Minecraft 15w32a, Minecraft 15w32b, Minecraft 15w32c
    • None
    • Confirmed

      My log is spammed with these:
      [16:05:17] [Server thread/WARN]: Tried to add entity with duplicate UUID c9904869-a99c-49eb-b746-b2b128f607b0

      One way to reproduce

      1. Build and turn on a nether portal.
      2. Push a pig into the portal.
      3. The pig disappeared and in the launcher there is the warning "Tried to add entity with duplicate UUID..."

      It works with any entity that can teleport besides the player and with end and nether portals.
      There might also be other situations in which this bug appears but this is one where it shouldn't for sure. To be clear: This deletes entities instead of porting them!

      Possible reason for this bug

      I assume that the reason this is happening, is that when entities are teleported to an other dimension they get duplicated and their clone is sent to the other dimension.
      The cloned entity probably has the same UUID and therefore causes this problem.

      Moderator node:
      Also occuring without any portals, see comment

      Confirmed in 15w31c. No portals at all. Plain survival on new world, no commands, no eggs. Heavy console spamming (4 to 8 errors/minute) causing significant server lags.

      and MC-84645

      I mean, like this:

      [16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID 9ab31ebc-7c46-48bd-b544-427d4bc862a0
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID 0daf1cc6-5dc4-4029-8365-90e7b31b67c3
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID 7e8f3c03-e0a4-4827-90b9-74ef80799eeb
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID 73f26e4c-1d4b-453c-94b5-840b6493bfa7
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID 22e37536-a519-423d-aee7-ffaeb8c15c99
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID ce23a2c9-ed5d-4fa6-9fac-1eff3cde177b
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID 72cb186a-9b82-4727-bfe2-0996aeda64b3
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID 5735f2c2-0ed4-4247-af20-83add75f6734
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID 9aa74053-a63e-437c-b423-a7043cb0a470
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID 314fccd6-b476-4f80-b9ce-516dc80f7154
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID 1cc80483-084b-4a7f-84fb-05b6ad0fda3c
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID 18b6f6fc-de44-4f9e-9475-97a40fdff532
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID b8e2c921-7ead-4e1a-a5f6-bf5c9395993f
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID 8b6b245f-5f16-48ce-9cc6-794c3d982283
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID 2a4ea85d-5aab-42db-9a18-e99acafb4028
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID a33ea6b7-dc02-446d-a85e-5a7fbcae9c10
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID 4bac6bac-ecbc-4a8b-9de3-fc4f08b361cf
[16:05:24] [Server thread/WARN]: Tried to add entity with duplicate UUID 2c53b3f6-9114-4e59-8a1d-e2cc028bdb45
[16:05:31] [Server thread/WARN]: Tried to add entity with duplicate UUID b66bcfa4-fb50-4691-89ff-5add1db3bdcb
[16:05:31] [Server thread/WARN]: Tried to add entity with duplicate UUID c52bc750-fb20-477d-8901-0f54aa2afc0d
[16:05:31] [Server thread/WARN]: Tried to add entity with duplicate UUID d259f2cb-4070-403f-bcd2-823b2be1fca6
[16:05:31] [Server thread/WARN]: Tried to add entity with duplicate UUID ebc8a4a0-5483-4a77-bc1b-02d3076590da
[16:05:31] [Server thread/WARN]: Tried to add entity with duplicate UUID 4b8fb5f1-b085-4c14-8f7d-3f6031879181
[16:05:31] [Server thread/WARN]: Tried to add entity with duplicate UUID 8f8a508c-dbbf-4d9b-888f-da9af3405718
[16:05:31] [Server thread/WARN]: Tried to add entity with duplicate UUID e540eae6-5fb7-4fd1-8171-d09582cf9b7c
[16:05:31] [Server thread/WARN]: Tried to add entity with duplicate UUID 6f96de8c-6c29-4a53-9d65-e36949b063e2
[16:05:31] [Server thread/WARN]: Tried to add entity with duplicate UUID 53bf038b-685e-4293-91c7-3806f5d212f7
[16:05:33] [Server thread/WARN]: Tried to add entity with duplicate UUID b04b6840-f6f3-4301-83cc-0f2992e7c30e
[16:05:33] [Server thread/WARN]: Tried to add entity with duplicate UUID 7739bad1-a3ca-4c02-b2f5-823f67e9fc7e
[16:05:33] [Server thread/WARN]: Tried to add entity with duplicate UUID 717a78b9-ab22-4908-8481-0c06f0ac5ea3

      What is this?

        1. mc 15w31c 1fps.jpg
          mc 15w31c 1fps.jpg
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            searge [Mojang] Searge (Michael Stoyke)
            Wullepa Jasper van den Berg
            Votes:
            29 Vote for this issue
            Watchers:
            23 Start watching this issue

              Created:
              Updated:
              Resolved:
              CHK: