[BUG] Opening the Player skin feature tool repeatedly causes the application to crash.

[7N4D6Un]

please make sure you are using the latest ETF version before submitting an issue, you might also find a dev build
fixing this issue already on my discord https://discord.com/invite/rURmwrzUcz in the #dev-blog channel

Describe the issue

• What happened?
  After opening the Player Skin Feature Tool, closing it, and then reopening it, the game crashed.

• What were you doing when it happened?
  This issue can be reproduced both in single-player saves and on the server.

Crash log
https://mclo.gs/tPUWJJj

Your setup: (please complete the following information):
I only installed
entity_texture_features-7.1.1-26.2-fabric.jar
fabric-api-0.155.0+26.2.jar
modmenu-20.0.1.jar

• Have you checked the FAQ in the Readme, or Discord, to see if it is a known issue?
  I searched on Discord and also tried the dev version.