diff --git a/Content.Server/Procedural/DungeonJob/DungeonJob.AutoCabling.cs b/Content.Server/Procedural/DungeonJob/DungeonJob.AutoCabling.cs
index f9712af6ab..e21c803e28 100644
--- a/Content.Server/Procedural/DungeonJob/DungeonJob.AutoCabling.cs
+++ b/Content.Server/Procedural/DungeonJob/DungeonJob.AutoCabling.cs
@@ -65,6 +65,8 @@ public sealed partial class DungeonJob
             {
                 var newStart = remaining.First();
                 frontier.Enqueue(newStart, 0f);
+                if (!costSoFar.ContainsKey(newStart))
+                    costSoFar[newStart] = 0f;
                 lastDirection[newStart] = Direction.Invalid;
             }