Issue description: server crash when breaking exporter when someone else is looking into the exporter

What happens: another player was looking into the exporter and another player broke the exporter and the server crashed

What you expected to happen: it not to crash

Steps to reproduce:

1. one player look in the exporter
2. one player break exporter
3. server then crashes
   ...

Version (make sure you are on the latest version before reporting):

• Minecraft: 1.16.5
• Forge: 36.0.21
• Refined Storage: 1.9.12

Does this issue occur on a server? [yes]

If a (crash)log is relevant for this issue, link it here:

[https://pastebin.com/9VWXNGhk]