Add various protections against the construction functionality introduced by KSP 1.11

Author: KSP-TaxiService

src/RemoteTech/FlightComputer/FlightComputer.cs

@@ -164,11 +164,14 @@ public FlightComputer(ISignalProcessor s)
 
             // Add RT listeners from KSP Autopilot
             StockAutopilotCommand.UIreference = GameObject.FindObjectOfType<VesselAutopilotUI>();
-            for (var index = 0; index < StockAutopilotCommand.UIreference.modeButtons.Length; index++)
+            if (StockAutopilotCommand.UIreference != null)
             {
-                var buttonIndex = index; // prevent compiler optimisation from assigning static final index value
-                StockAutopilotCommand.UIreference.modeButtons[index].onClick.AddListener(delegate { StockAutopilotCommand.AutopilotButtonClick(buttonIndex, this); });
-                // bad idea to use RemoveAllListeners() since no easy way to re-add the original stock listener to onClick
+                for (var index = 0; index < StockAutopilotCommand.UIreference.modeButtons.Length; index++)
+                {
+                    var buttonIndex = index; // prevent compiler optimisation from assigning static final index value
+                    StockAutopilotCommand.UIreference.modeButtons[index].onClick.AddListener(delegate { StockAutopilotCommand.AutopilotButtonClick(buttonIndex, this); });
+                    // bad idea to use RemoveAllListeners() since no easy way to re-add the original stock listener to onClick
+                }
             }
         }
 

src/RemoteTech/Modules/ModuleRTAntenna.cs

@@ -784,7 +784,7 @@ private void OnPartUndock(Part p)
 
         private void OnVesselModified(Vessel v)
         {
-            if (RTCore.Instance != null && mRegisteredId != vessel.id)
+            if (RTCore.Instance != null && vessel != null && mRegisteredId != vessel.id)
             {
                 RTCore.Instance.Antennas.Unregister(mRegisteredId, this);
                 mRegisteredId = vessel.id;

src/RemoteTech/Modules/ModuleSPU.cs

@@ -23,18 +23,18 @@ public class ModuleSPU : PartModule, ISignalProcessor
 
         public string VesselName
         {
-            get { return vessel.vesselName; }
-            set { vessel.vesselName = value; }
+            get { return vessel != null ? vessel.vesselName : "vessel-null"; }
+            set { if(vessel != null) vessel.vesselName = value; }
         }
-        public bool VesselLoaded => vessel.loaded;
+        public bool VesselLoaded => vessel != null && vessel.loaded;
         public Guid VesselId { get; private set; }
 
-        public Vector3 Position => vessel.GetWorldPos3D();
-        public CelestialBody Body => vessel.mainBody;
+        public Vector3 Position { get { return vessel != null ? vessel.GetWorldPos3D() : new Vector3d(); } }
+        public CelestialBody Body { get { return vessel != null ? vessel.mainBody : null; } }
         public bool Visible => MapViewFiltering.CheckAgainstFilter(vessel);
-        public bool Powered => IsRTPowered;
+        public bool Powered => vessel != null && IsRTPowered;
 
-        public bool IsCommandStation => IsRTPowered && IsRTCommandStation && vessel.GetVesselCrew().Count >= RTCommandMinCrew;
+        public bool IsCommandStation => IsRTPowered && IsRTCommandStation && vessel != null && vessel.GetVesselCrew().Count >= RTCommandMinCrew;
         public FlightComputer.FlightComputer FlightComputer { get; private set; }
         public Vessel Vessel => vessel;
         public bool IsMaster => Satellite != null && ReferenceEquals(Satellite.SignalProcessor, this);
@@ -279,7 +279,7 @@ public void OnDestroy()
 
         public void OnVesselModified(Vessel v)
         {
-            if (RTCore.Instance == null || VesselId == vessel.id)
+            if (RTCore.Instance == null || vessel == null || VesselId == vessel.id)
                 return;
 
             RTCore.Instance.Satellites.Unregister(VesselId, this);

src/RemoteTech/Modules/ModuleSPUPassive.cs

@@ -1,6 +1,4 @@
 using System;
-using System.Linq;
-using System.Text;
 using UnityEngine;
 
 namespace RemoteTech.Modules
@@ -14,15 +12,15 @@ public class ModuleSPUPassive : PartModule, ISignalProcessor
         public string Name => $"ModuleSPUPassive({VesselName})";
         public string VesselName
         {
-            get { return vessel.vesselName; }
-            set { vessel.vesselName = value; }
+            get { return vessel != null ? vessel.vesselName : "vessel-null"; }
+            set { if(vessel != null) vessel.vesselName = value; }
         }
-        public bool VesselLoaded => vessel.loaded;
+        public bool VesselLoaded => vessel != null && vessel.loaded;
         public Guid VesselId { get; private set; }
-        public Vector3 Position => vessel.GetWorldPos3D();
-        public CelestialBody Body => vessel.mainBody;
+        public Vector3 Position { get { return vessel != null ? vessel.GetWorldPos3D() : new Vector3d(); } }
+        public CelestialBody Body { get { return vessel != null ? vessel.mainBody : null; } }
         public bool Visible => MapViewFiltering.CheckAgainstFilter(vessel);
-        public bool Powered => Vessel.IsControllable;
+        public bool Powered => vessel != null && vessel.IsControllable;
         public bool IsCommandStation => false;
         public FlightComputer.FlightComputer FlightComputer => null;
         public Vessel Vessel => vessel;
@@ -74,7 +72,7 @@ public void OnPartUndock(Part p)
 
         public void OnVesselModified(Vessel v)
         {
-            if (RTCore.Instance != null && VesselId != vessel.id)
+            if (RTCore.Instance != null && vessel != null && VesselId != vessel.id)
             {
                 RTCore.Instance.Satellites.Unregister(VesselId, this);
                 VesselId = vessel.id; 

src/RemoteTech/UI/FilterOverlay.cs

@@ -72,7 +72,11 @@ private Rect Position
                 {
                     // New side bar location checking... if someone finds a better method for this please fix
                     if (mImg == null)
-                        mImg = GameObject.Find("Side Bar").GetChild("bg (stretch)").GetComponent<UnityEngine.UI.Image>();
+                    {
+                        var obj = GameObject.Find("Side Bar");
+                        if (obj != null)
+                            mImg = obj.GetChild("bg (stretch)").GetComponent<UnityEngine.UI.Image>();
+                    }
 
                     posX = mImg.rectTransform.rect.width * GameSettings.UI_SCALE;
                 }
@@ -95,7 +99,11 @@ private Rect PositionSatellite
 
                     // Same new side bar checking... if someone finds a better method for this please fix
                     if (mImg == null)
-                        mImg = GameObject.Find("Side Bar").GetChild("bg (stretch)").GetComponent<UnityEngine.UI.Image>();
+                    {
+                        var obj = GameObject.Find("Side Bar");
+                        if(obj != null)
+                            mImg = obj.GetChild("bg (stretch)").GetComponent<UnityEngine.UI.Image>();
+                    }
                     posX = mImg.rectTransform.rect.width * GameSettings.UI_SCALE;
                 }
 

src/RemoteTech/VesselExtension.cs

@@ -11,6 +11,8 @@ public static class VesselExtension
         /// <returns>true if the vessel has a local control, false otherwise.</returns>
         public static bool HasLocalControl(this Vessel vessel)
         {
+            if (vessel == null) return false;
+
             // vessel must be a control source and it must be crewed or not implementing a module processor
             var hasLocalControl = vessel.parts.Any(p => (p.isControlSource > Vessel.ControlLevel.NONE) &&
                 (p.protoModuleCrew.Any() || !p.FindModulesImplementing<ISignalProcessor>().Any() ||