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Crash when load level to AR scene

Hi Everyone,

i'm working on project that has 2 scenes (1 loading scene (non - AR screen), and one main screen).

Loading screen will download assetbundle from server and load dataset dynamic for AR screen. After downloaded all asset, one trigger will call to start AR screen. But SOMETIME, it will crash in this statement (LoadSceneAsync in Unity). It just happen with iphone 5C and iphone 5, not happen on iphone 6 and 6S.

When i try to figure out the issue, i face to this crash report on divice:

Exception Type:  EXC_BAD_ACCESS (SIGSEGV) Exception Subtype: KERN_INVALID_ADDRESS at 0xd28c5d39 Triggered by Thread:  0

Filtered syslog: None found

I have a research on Google and read that is a bug of Unity but dont have solution yet.

In this forum, anyone have the same issue? And anyone have solution for it?

Thanks!!!