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Fixed in 2019.3.X

Fixed in 2019.1.X, 2019.2.X

Duplicate in 2018.4.X



Found in



Issue ID




Exiting the Update method with debugger after async/await Task.Run(method) is called will cause Unity to crash



How to reproduce:
1. Open attached project "" and scene "AsyncRepro"
2. Open Visual Studio and attach the Unity Editor for debugging
3. In Visual Studio, place a breakpoint on line 75 (on int a = 1) and uncomment line 46
4. In Unity Editor, enter Play mode
5. In Visual Studio, press "Step Out" button multiple times (shortcut is F10)
6. Observe Unity Editor

Expected result: the Editor is debugged without any casualties
Actual result: the Editor crashes

Reproducible with: 2018.3.0b2, 2018.3.14f1, 2018.4.0f1, 2019.1.2f1, 2019.2.0b2, 2019.3.0a2
Not reproducible with: 2018.2.0a1, 2018.2.21f1
Could not test with: 2017.4.27f1, 2018.3.0a1, 2018.3.0b1 (Visual Studio does not find coresponding location, unable to debug)

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