Stacktrace error

[DebuffPvP]

Confirmation

• [X] I have read the FAQ.
• [X] I have tested the latest development build of Holographic Displays and the bug is still present.
• [X] I have updated Spigot to the latest release for my particular Minecraft version.
• [X] I made sure the bug hasn't already been reported on the issue tracker.

Description

I get this error in console and the holograms in the server have disappeared but are still in the database file.

How to reproduce

I don't know

Server version

This server is running ReliableSpigot version 2.4.4 (MC: 1.8.8) (Implementing API version 1.8.8-R0.3)

Holographic Displays version

HolographicDisplays version 3.0.0-SNAPSHOT-b226

Installed plugins that allow players to join with multiple Minecraft versions

ViaVersion, ViaRewind

Additional information

https://pastebin.com/QKCFiqPj