Error
ConcurrentModificationException
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## Generated Bug Report
<!--- DO NOT OPEN A ISSUE IF THIS IS A PLUGIN ERROR -->
PLUGIN ERROR: TRUE
### Expected Behavior
<!--- What would you expect to happen -->
### Actual Behavior
<!--- What actually happened -->
### Steps to Reproduce
<!--- Reliable steps which someone can use to reproduce the issue. Please do not create issues for non reproducible bug! -->
### OS and Versions
* Nukkit Version: git-666afc5
* Java Version: OpenJDK 64-Bit Server VM (1.8.0_242-8u242-b08-0ubuntu3~18.04-b08)
* Host Configuration:
| Item | Value |
|:----:|:-----:|
| Host OS | Linux-amd64 [4.15.0-74-generic] |
| Memory(RAM) | 2.1 GB |
| Storage Size | 16.3 GB |
| Storage Type | Disk 0
avail=1.9 GB, total=16.3 GB) |
| CPU Type | UNKNOWN |
| CPU Core Count | 4 |
### Crashdump, Backtrace or Other Files
```
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909)
at java.util.ArrayList$Itr.next(ArrayList.java:859)
at zen.zchat.Tasks.NameTag.run(NameTag.java:14)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)