Unity Issue Tracker - Crash on scripting_class_is_subclass_of when trying to display corrupted data from JsonUtility when using SerializeReference

Duplicate

Votes

1

Found in

2019.3

2019.4

2019.4.4f1

2020.1

2020.2

Issue ID

1265045

Regression

No

Crash on scripting_class_is_subclass_of when trying to display corrupted data from JsonUtility when using SerializeReference

Mono

-

Jul 22, 2020

Reproduction steps:
1. Open the attached project ("1265045.zip")
2. Open scene "TestJsonRead"
3. Enter Play mode
4/5. Press the "Start" button in Game View
4/5. Select "Canvas" GameObject in The Hierarchy so it's properties would be displayed in the Inspector
(4th and 5th steps can be interchangeable)

Reproducible with: 2019.3.16f1, 2019.4.8f1, 2020.1.2f1, 2020.2.0a20
Couldn't test with: 2018.4.26f1 due to compilation errors and SerializeReference was introduced in 2019.3

First lines of the stacktrace:
0x00007ff6639834aa (Unity) scripting_class_is_subclass_of
0x00007ff662251313 (Unity) ManagedReferencesRegistry::RegisterReference
0x00007ff6639c570b (Unity) StreamedBinaryWrite::TransferWithTypeString<ArrayOfManagedReferencesTransferer>
0x00007ff6639d92f1 (Unity) Transfer_ManagedObjectRef<StreamedBinaryWrite,1>
0x00007ff6639b40ac (Unity) TransferField_LinearCollection<ReportScriptingObjectsTransfer>

Notes:
- Might crash silently
- Before the crash this assertion failure might show up in Editor logs:
"* Assertion at ..\mono\metadata\class.c:8919, condition `ac->rank' not met"
- Doesn't always crash, but consistent enough to investigate