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Fixed in 2018.3.X

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

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. 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.

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Comments (202)

  1. 009

    Aug 17, 2017 02:00

    Is it possible that is cause by Unity Collaborate ? Found out the only differences from me and my colleagues is this.

  2. zeday

    Aug 16, 2017 20:06

    Oh, Unity, WHY.....??? Why have you done this to me ...and others apparently??
    I have lost hours of work, hundreds of lines of code.
    WHY?????!

  3. frankmat

    Aug 16, 2017 17:00

    Same problem... annoying as hell. I've lost so much work and finding I have to save every little change I make. Any update on when this will be fixed.

  4. 009

    Aug 16, 2017 08:30

    Occur when after I edit the code with monoDevelope and come back to the Editor. about 5 times within 6 hours of working. Hope this can fixed soon.

    Unity 2017.1.0f3 in Window OS

  5. demonpants

    Aug 16, 2017 03:46

    Happening to me since upgrading to 2017.1.0f3 . It's consistent after 30 minutes to an hour of use, it crashes. It usually seems to crash while I'm saving, but that's not always.

    OS: Mac

  6. rrahim

    Aug 15, 2017 14:36

    I've been having this issue since switching to 2017.1.0f3.
    It seems to be a random issue and causes alot of wasted time. Is there currently any workaround for it?

  7. xtyler

    Aug 14, 2017 18:23

    Mac, 2017.0.1f3 - Please let me know if I can help repro, I get it several times a day and it's very hurtful to our progress.

  8. screenname_taken

    Aug 13, 2017 22:11

    God! Please friggin fix it! We are losing progress and need to reset scenes!!!
    The hell?! 2017.1.0p3 and still happening.

  9. PNUMIA-Rob

    Aug 13, 2017 17:11

    This is clearly happening to a large group of people and is certainly a hefty annoyance. Can we get some official Unity word on what the plan is for this? If this issue was any more frequent it would be a show stopper.

  10. Askmejin

    Aug 13, 2017 16:19

    Happens always after a period of time (~half an hour) when switching from Visual Studio to Unity and hitting play. I have not experienced error to show up when using JetBrains Rider yet.

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