Right-clicking in the Project window provides the ability to "Open" always. Clicking the "Open" context-menu button, while no asset is selected, displays an ArgumentOutOfRangeException. Exception thrown while invoking [OnOpenAssetAttribute] method 'Unity.CodeEditor.CodeEditor:OnOpenAsset (int,int,int)' ArgumentOutOfRangeException: startIndex cannot be larger than length of string. Spoiler: Video Reproduce Open attached project or create a new one Right-click in the Project window while no asset is selected Choose "Open" from the context-menu Actual Unity outputs an ArgumentOutOfRangeException exception. Expected The "Open" button should be disabled if there is no selection.