From 1df8402c17a225a7ffe096d6f755a7b85d69b29f Mon Sep 17 00:00:00 2001
From: Vera Aguilera Puerto <gradientvera@outlook.com>
Date: Thu, 14 Oct 2021 11:12:54 +0200
Subject: [PATCH] Fix rare exception when CableVis tries to update an entity
 not on a valid grid.

---
 Content.Server/Power/EntitySystems/CableVisSystem.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Content.Server/Power/EntitySystems/CableVisSystem.cs b/Content.Server/Power/EntitySystems/CableVisSystem.cs
index e9b5480550..1932f55b97 100644
--- a/Content.Server/Power/EntitySystems/CableVisSystem.cs
+++ b/Content.Server/Power/EntitySystems/CableVisSystem.cs
@@ -50,6 +50,11 @@ namespace Content.Server.Power.EntitySystems
                 var mask = WireVisDirFlags.None;
 
                 var transform = EntityManager.GetComponent<ITransformComponent>(uid);
+
+                // Only valid grids allowed.
+                if(!transform.GridID.IsValid())
+                    continue;
+
                 var grid = _mapManager.GetGrid(transform.GridID);
                 var tile = grid.TileIndicesFor(transform.Coordinates);
                 var node = nodeContainer.GetNode<CableNode>(cableVis.Node);