Fix gas analyser error. (#11386)

Content.Server/Atmos/EntitySystems/GasAnalyzerSystem.cs

@@ -1,4 +1,4 @@
-using Content.Server.Atmos;
+using Content.Server.Atmos;
 using Content.Server.Atmos.Components;
 using Content.Server.NodeContainer;
 using Content.Server.NodeContainer.Nodes;
@@ -87,7 +87,7 @@ namespace Content.Server.Atmos.EntitySystems
             UpdateAppearance(component);
             if(!HasComp<ActiveGasAnalyzerComponent>(uid))
                 AddComp<ActiveGasAnalyzerComponent>(uid);
-            UpdateAnalyzer(uid);
+            UpdateAnalyzer(uid, component);
         }
 
         /// <summary>
@@ -143,8 +143,14 @@ namespace Content.Server.Atmos.EntitySystems
             if (!Resolve(uid, ref component))
                 return false;
 
+            if (!TryComp(component.User, out TransformComponent? xform))
+            {
+                DisableAnalyzer(uid, component);
+                return false;
+            }
+
             // check if the user has walked away from what they scanned
-            var userPos = Transform(component.User).Coordinates;
+            var userPos = xform.Coordinates;
             if (component.LastPosition.HasValue)
             {
                 // Check if position is out of range => don't update and disable
@@ -175,6 +181,13 @@ namespace Content.Server.Atmos.EntitySystems
             var deviceFlipped = false;
             if (component.Target != null)
             {
+                if (Deleted(component.Target))
+                {
+                    component.Target = null;
+                    DisableAnalyzer(uid, component, component.User);
+                    return false;
+                }
+
                 // gas analyzed was used on an entity, try to request gas data via event for override
                 var ev = new GasAnalyzerScanEvent();
                 RaiseLocalEvent(component.Target.Value, ev, false);