I've been messing with this plugin for a while, and after some time, players start getting kicked for this error below and I also have to reset the whole map when this happens.

*******/76561############/Paranormal disconnecting: Exception (cs:106660): NullReferenceException: Object reference not set to an instance of an object. Client.%0116cfef8ec5ee91f8af572f01d6a110e0eaafeb (%56c3186b747d9637963911ecf6eb41fe156118d4 %45e8f6722b19c0cd94fb1c9f9291289141d7ec41, System.Int64 %977ca184660b7130a45c541eaaed86f1f7642765) (at <00000000000000000000000000000000>:0) Client.%5b2bdcf833c16674cd3ab81c7d52b33c050027ac (%20f77681c6e3ae1005c0d840e93674b186cbbe15 %63c6565d03109001109ec6023b3d40960e022961) (at <00000000000000000000000000000000>:0) %85c327f1d8e4d9ee8a980a7dca9d711779860a04+%4bcd75f7344bf2e13aa08175b2f290300f208b6e.%09f8624b9156d47d61f9f996a19d85a77d773954 (%f5e7f4c8fae69fff7d8cbaaaec4bb3821df0c7bb %86e7c1d06bb6daff02f60d2e1b91a616e305ddee) (at <00000000000000000000000000000000>:0) %d830109f5ee40bbe26d855112a713a82d427c369.%a089240229796ba1b6063b9d69f3c79a0791bb6b () (at <00000000000000000000000000000000>:0) Client.Update () (at <00000000000000000000000000000000>:0) UnityEngine.Debug:LogException(Exception) %4bcd75f7344bf2e13aa08175b2f290300f208b6e:%09f8624b9156d47d61f9f996a19d85a77d773954(%f5e7f4c8fae69fff7d8cbaaaec4bb3821df0c7bb) %d830109f5ee40bbe26d855112a713a82d427c369:%a089240229796ba1b6063b9d69f3c79a0791bb6b() Client:Update() 
​

this is my VirtualItems.json

{
    "Rulesets": [
        {
            "Name": "build",
            "All deployables are free": true,
            "Free deployables": [],
            "Items": {
                "metal.fragments": 3000,
                "metal.refined": 3000,
                "stones": 3000,
                "wood": 3000,
                "cloth": 3000,
                "tarp": 25,
                "metalblade": 25,
                "rope": 25,
                "fat.animal": 25,
                "ammo.rifle.hv": 128,
                "ammo.pistol": 128,
                "ammo.rifle": 128,
                "ammo.pistol.hv": 128,
	        "gears": 25
            }
        }
    ]
}

Are you using the Custom Item Definitions plugin? There was an interaction bug with Item Retriever (a dependency of this plugin) which caused player kicks, which was recently fixed with a new release of Item Retriever.

when was it last updated? I did this yesterday and woke up today to the server having client issues.

WhiteThunder

Are you using the Custom Item Definitions plugin? There was an interaction bug with Item Retriever (a dependency of this plugin) which caused player kicks, which was recently fixed with a new release of Item Retriever.

Item Retriever was updated 12 days ago. That's the only known cause of kicks in the history of these plugins. Since I can't reproduce the issue, you'll have to do some troubleshooting on your side to narrow down which minimal combination of plugins causes the issue.