getting this error after blacklisting an ip of cheaters, every player joins the error happens

(14:59:31) | MySql command callback raised an exception (NullReferenceException: Object reference not set to an instance of an object) at Oxide.Plugins.EnhancedBanSystem.RangeFromIP (System.String sourceIP, System.String& range1, System.String& range2, System.String& range3) [0x00028] in <5ffb2edb684946138a499f46963237e4>:0 at Oxide.Plugins.EnhancedBanSystem+c__AnonStorey16.<>m__0 (System.Collections.Generic.List`1[T] list) [0x00142] in <5ffb2edb684946138a499f46963237e4>:0