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Packaged game crashed on macOS when a niagara system is used

In the packaged game, it's crashed when I'm spawning a niagara system. Not instantly, it starts to work but then crash, every time. If don't use the niagara system then it's not crashing.

Any ideas where to look/what to tweak?

Error message:

 Assertion failed: LayoutConstantBufferSize == Layout->ConstantBufferSize

Full crash log: https://pastebin.com/ZHiHe41W

Specs: UE 4.21.2 (source build, no changes to the rendering part) Metal 2.0 or 2.1 (tried both, the same crash) Xcode 9.4.1 or 10.2 (both are the same)

macbook pro 13" integrated graphics (iris 6100 1536 mb)

Product Version: UE 4.21
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asked Apr 11 '19 at 12:19 PM in Bug Reports

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avatar image Jeff A ♦♦ STAFF Apr 11 '19 at 07:17 PM


We've recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.



avatar image norlin Apr 12 '19 at 08:46 AM

Thank you, I know about this one, just currently I'm not sure it's a real bug – that's why I've posted it here, to check with a community in case if anyone faced the same issue.

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