Unity Issue Tracker - “ArgumentException: Object reference not set to an instance of an object” errors are thrown when adding the component with Entity as Key for HashMap

Fixed

Fixed in 6000.4.0a6, 6000.5.0a1

Votes

Found in

Issue ID

Regression

“ArgumentException: Object reference not set to an instance of an object” errors are thrown when adding the component with Entity as Key for HashMap

-

Feb 07, 2025

Reproduction steps:
1. Open the attached “EcsPlayground.zip” project
2. Enter the Play Mode
3. Observe the Console window

Expected result: No errors are thrown
Actual result: “ArgumentException: Object reference not set to an instance of an object” errors are thrown

Reproducible with: 2022.3.58f1, 6000.0.38f1, 6000.1.0b5, 6000.2.0a2

Reproducible on: Windows 11
Not reproducible on: No other environment tested

Workaround: Replace {{UnsafeHashMap<Entity, ...>}} with {{UnsafeHashMap<CertainlyNotAnEntity, ...>}}