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Fixed in Unity 2019.3



Found in


Issue ID




Debugging Unity C# code containing Async/Await breaks debugger & causes Editor to hard crash




Priority: 2Necessary for shipping a final release


Severity: 1Crash, freeze, data loss, work stops

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 62 (on int b = 0)
4. In Unity Editor, enter Play mode
5. In Visual Studio, press "Step Out" button (shortcut is Shift + F11)
6. Observe Unity Editor

Expected result: the Editor runs smoothly
Actual result: the Editor crashes

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

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