decentraland / decentraland/unity-explorer
System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
- Dominant language
- C#
- Stars
- 23
- Forks
- 17
- Avg merge
- 2d 16h
- Merged PRs (30d)
- 101
Description
Sentry Issue: [UNITY-EXPLORER-P8P](https://decentraland.sentry.io/issues/7509711356/)
```
System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
File "il2cpp-codegen.h", line 792, in IsParticipantOnline
File "DCL.Social__20.cpp", line 28516, in IsParticipantOnline
File "DCL.Social__20.cpp", line 28127, in OnGetItemByIndex
File "superscrollview.runtime.cpp", line 17722, in RefreshAllShownItemWithFirstIndex
File "il2cpp-codegen.h", line 792, in RefreshVisibleElements
...
(11 additional frame(s) were not displayed)
```
This issue was automatically created by Sentry via [Explorer Alpha Github Issue Creation](https://sentry.io/organizations/decentraland/monitors/alerts/3130340/)
Contributor guide
Research direction
Start with the Sentry trace and inspect the source behind IsParticipantOnline, OnGetItemByIndex, and RefreshVisibleElements. Determine which collection is being changed during enumeration, reproduce the failure if possible, and verify that the participant refresh path no longer raises this exception.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- csharp, unity
- Domain
- desktop-dev, game-dev
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Active
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100