Issue description:

Adding new lasers to a laser network into which an external storage is plugged into causes a crash

Steps to reproduce:

1. Create and Actually additions laser Network
2. Attach externas storage to Item Interface
3. Connect at least 5 more item relays, then connect to the main system, crashes almost right away
   ...

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

• Minecraft: 1.11.2
• Forge:
• Refined Storage:

Does this issue occur on a server? [yes/no]

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

crash-2017-04-01_10.33.42-server.txt

[pastebin/gist/etc link here]