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Fixed in 2018.3

Fixed in 5.5, 5.6, 2017.1, 2017.2, 2018.1, 2018.2

Votes

334

Found in

5.6.0b5

2017.1.0f3

Issue ID

873467

Regression

Yes

Unity throws out Fatal Error: Callback registration failed kMaxCallback

Themes

-

Unity throws out Fatal Error: "Callback registration failed kMaxCallback" after working with the project for 30 minutes or more. It appears randomly.

Steps:
1. Actively use Unity for more than 30 minutes

Actual: Unity continues to work
Result: Unity crashes with Fatal Error.

Reproducible with: 2017.1.4f1, 2017.2.3p1, 2017.4.4f1, 2018.1.3f1, 2018.2.0b6

Note:
Reproduced on macOS, Windows, Linux.
Bug Report window does not appear.
Scene files are not restored after reopening Unity so all not saved Scenes are lost.

  1. Response avatar

    karl_jones

    Jan 04, 2019

    Please file a new bug report If you are still encountering this problem. The error message is a symptom and can be caused by many different areas. The area for this bug has been fixed.

Comments (205)

  1. C5035e6f9ac6c7ee6b43b629d5ec96ea?d=mm

    su1935

    Aug 30, 2017 16:32

    unity exits automatically many times a day.

  2. 8c126b2f288bc3a5cbd76422c7f97077?d=mm

    letscodestuff

    Aug 28, 2017 03:27

    I just installed Unity today version 2017.1.0p5. I have started watching some tutorials on the site and going through them and appears this happens randomly anytime I alt tab between Unity and Visual Studio. It can happen every 30 minutes to as soon as I start Unity back up and alt tab for the first time.

  3. 22779d66753cc4af08a34a461ce9978a?d=mm

    AlexKostas

    Aug 27, 2017 17:39

    Now it is common for me. It happens at least 6 times a day to me. And I have already lost many hours of work. I have Unity 2017.1. Fix it please!!!

  4. B73bcdee47ea96e48ea9fe349cc61ada?d=mm

    retro_boy

    Aug 26, 2017 23:20

    A dozen crashes a day with this error on MacOS with latest version of Unity. Praying for a fix.

  5. 2ecf0c3c4065a1a1fbf18f32275190fe?d=mm

    Barry100

    Aug 25, 2017 08:58

    this is happening to me now around 5 times per day! Very frustrating. Lost some work a few times now.

    2017.1.0.f3

  6. A426725f19002fd2bbb88ed2d43d1a9e?d=mm

    HiLiX

    Aug 23, 2017 10:25

    Most annoying bug! I almost destroyed my keyboard because of that ;) ... Still happening on Unity 2017.1.0p4(p3)

  7. B89ae67e47d974f5a427480148083a89?d=mm

    Regnian

    Aug 20, 2017 18:51

    Ouch, save often and always before play mode! My scripts were not erased, but my editor creations were. Sadness is overwhelming. =P

  8. Dbd49e53586c7ee10350caa4e5220f76?d=mm

    Blazerker

    Aug 20, 2017 13:22

    Please, please release an urgent fix for this bug! I get this up to 10 times a day working on projects! Occurs mostly switching between monoDevelop and Unity Editor often during debug sessions.

  9. 6eaec9c6f56d1517958733fac1fabde3?d=mm

    piratepoots

    Aug 19, 2017 20:46

    Zeday, this issue doesn't affect scripts. It affects the editor, not monodevelop or your other scripting programs, so just don't close out of your other programs. I hope this helps you moving forward if you ever experience this issue again.

  10. Dc1b254760f44d16cd4f684456bf554f?d=mm

    karl_jones

    Aug 18, 2017 15:24

    A possible fix is on the way.
    Please direct feedback to this thread: https://forum.unity3d.com/threads/annoying-bug-editor-crashing-with-increase-kmaxcallback.487655/

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