Quit() throws an error

**Information**

ClassicUO Version: 1.1.0.172
ClassicAssist Version: 4.425.14
Client Version: 7.0.98.0
Shard: UODreams

**Describe the bug**
Any attempt to use the Quit() function gives the following error:

"Object reference not set to an instance of an object"

**To Reproduce**
Steps to reproduce the behavior:

call "Quit()"

**Expected behavior**
Should close the client