MAUI - 10.0.51 - 10.0.60 - *** Terminating app due to uncaught exception 'ObjCRuntime.RuntimeException' #35580
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rokmeglicbit
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Replies: 2 comments 26 replies
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Crash log> |
16 replies
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@rolfbjarne I am showing MAUI code which creates error "ObjCRuntime.RuntimeException: Failed to marshal the Objective-C object 0x14b917480 (type: Microsoft_Maui_Platform_LayoutView). Could not find an existing managed instance for this object, nor was it possible to create a new managed instance (because the type 'Microsoft.Maui.Platform.LayoutView' does not have a constructor that takes one NativeHandle argument).". Should we fix the underlaying Objective-C code, but you need a project repo to reproduce? |
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@rolfbjarne step closer. I get this know: |
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@rolfbjarne I found out similar #34177 and #31780, #28990, #23050. Previous fix #23405 ... but looks like it still coming up @jfversluis . |
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Probably better to report something like this as a bug and not a discussion. Please do so with the concise details you came up with and a reproduction. Thanks! |
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@jfversluis ... can you check comment bellow #35580 (comment), is this enough? I do not want to copy paste @ibrahimahmed1998 reproduction code without his permission to open a bug. Can you check without this? |
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Minimal repro attached + root-cause analysis Attached a minimal repro (dotnet new maui + 4 files). It's a CollectionView whose The exception message points at a lifetime race, not a logic bug: "Could not find an existing managed instance for this object, nor was it possible iOS still holds the native LayoutView, but its managed peer has been GC'd because the This works on 10.0.51 and regresses somewhere in 10.0.52-10.0.60, and overlaps with @rolfbjarne with the repro in hand, would someone on the runtime/marshaling side be |
10 replies
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One time I came across the error "this should not happen" if I added this in the MainViewModel, which is infinite loop. it freezes the app and I get errors: ... but not always. It just shows the Cpu has to be really busy this to happen, that's why the await Task.delay(1) helps. |
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@ibrahimahmed1998 we need your help:) We found similar bug - #35370 (comment), but we can not reproduce it. Any idea how to reproduce it? |
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@ibrahimahmed1998 I tested this again on the latest MAUI 10.0.80, and the issue is still present. I’m consistently getting the following exception: What I’ve noticed is that the LIVE application uses MQTT, and it’s possible that MQTT callbacks are blocking or heavily loading the I/O or UI thread. This could explain why the test application does not crash, while the live application does. At this point, this is only an assumption. |
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Tested with a simple MQTT client (CoPilot AI), and it makes no difference. What’s strange is that the LIVE app works when running in iOS debugging mode, but when launched normally (without debugging), it crashes. |
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At least for my project, I figure it out, it is related to syncfusion/maui-toolkit/chart Sadly, I can not reproduce this for syncfusion/maui-toolkit/chart. Note. This is just my observation and I may be wrong, so I do not want to blame anybody without having a reproducable code. |
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After upgrading to MAUI 10.0.60 from 10.0.51, the app crashes often with the message bellow. Upgrade to 10.0.70 does not solve it. Looks like something in 10.0.51 to 10.0.60.
*** Terminating app due to uncaught exception 'ObjCRuntime.RuntimeException', reason: 'Failed to marshal the Objective-C object 0x11e74ebc0 (type: Microsoft_Maui_Platform_LayoutView). Could not find an existing managed instance for this object, nor was it possible to create a new managed instance (because the type 'Microsoft.Maui.Platform.LayoutView' does not have a constructor that takes one NativeHandle argument). (ObjCRuntime.RuntimeException)What I have found out is, that it works the first time. After killing the app, starting the app again, the error occurs.
I have pin pointed the error to XAML, in collectionView, Template host which is inside 'ItemTemplate'.
This 'Right' can be null, which means empty content.
If I remove this, it starts to work.
I have also tried to programmatically add this to collectionView and it works, if I do not add 'TemplateHost' if the Right is null.
Resources:
I have tried adding 'CustomView', but it does not help.
The log also shows 'ValidateSafeArea', was testing with SafeAreaEdges='none', but it does not work either.
Full log:
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