Error in the output log

[t1a2l]

NullReferenceException: Object reference not set to an instance of an object
at NetworkMultitool.UnionNodeMode.IsValidNode (UInt16 nodeId) [0x00000] in :0
at ModsCommon.BaseSelectToolMode1[TypeTool].RayCastNode (System.Collections.Generic.HashSet1 ignoreNodes, UInt16 nodeId, ModsCommon.Utilities.NodeSelection& selection, System.Single& t) [0x00000] in :0
at ModsCommon.BaseSelectToolMode1[TypeTool].RayCast (UInt16 segmentId, System.Collections.Generic.HashSet1 ignoreNodes, System.Single& priority, ModsCommon.Utilities.NodeSelection& nodeSelection, ModsCommon.Utilities.SegmentSelection& segmentSelection) [0x00000] in :0
at ModsCommon.BaseSelectToolMode1[TypeTool].RayCast (ModsCommon.Utilities.NodeSelection& nodeSelection, ModsCommon.Utilities.SegmentSelection& segmentSelection) [0x00000] in <filename unknown>:0 at ModsCommon.BaseSelectToolMode1[TypeTool].OnToolUpdate () [0x00000] in :0
at NetworkMultitool.BaseNetworkMultitoolMode.OnToolUpdate () [0x00000] in :0
at ModsCommon.BaseTool`2[TypeMod,TypeTool].OnToolUpdate () [0x00000] in :0
at ToolBase.FpsBoosterUpdate () [0x00000] in :0
at BehaviourUpdater.Updater.Update () [0x00000] in :0
UnityEngine.DebugLogHandler:Internal_LogException(Exception, Object)
UnityEngine.DebugLogHandler:LogException(Exception, Object)
UnityEngine.Logger:LogException(Exception, Object)
UnityEngine.Debug:LogException(Exception)
BehaviourUpdater.Updater:Update()