diff --git a/Source/RP0/SpaceCenter/Projects/VesselProject.cs b/Source/RP0/SpaceCenter/Projects/VesselProject.cs
index f1f6454d45a..54c98b920bf 100644
--- a/Source/RP0/SpaceCenter/Projects/VesselProject.cs
+++ b/Source/RP0/SpaceCenter/Projects/VesselProject.cs
@@ -1385,7 +1385,7 @@ public void MoveVesselToWarehouse()
                 MessageSystem.Instance.AddMessage(m);
             }
 
-            MaintenanceHandler.Instance.ScheduleMaintenanceUpdate();
+            MaintenanceHandler.Instance?.ScheduleMaintenanceUpdate();
         }
 
         public void ReleaseShipNode()
diff --git a/Source/RP0/SpaceCenter/SpaceCenterManagement.cs b/Source/RP0/SpaceCenter/SpaceCenterManagement.cs
index 371b8219939..ea25e9820be 100644
--- a/Source/RP0/SpaceCenter/SpaceCenterManagement.cs
+++ b/Source/RP0/SpaceCenter/SpaceCenterManagement.cs
@@ -460,6 +460,12 @@ public void FixedUpdate()
                     UpdateTechYearMults();
                     _lastYearMultUpdateUT = UT;
                 }
+
+                if (MaintenanceHandler.Instance == null)
+                {
+                    // Normally handled through MaintenanceHandler but that doesn't exist outside career mode
+                    ProgressBuildTime(UTDiff);
+                }
             }
 
             if (HighLogic.LoadedSceneIsFlight && IsSimulatedFlight)
@@ -953,6 +959,8 @@ public double GetBudgetDelta(double deltaTime)
         {
             // note NetUpkeepPerDay is negative or 0.
 
+            if (MaintenanceHandler.Instance == null) return 0;
+
             double averageSubsidyPerDay = CurrencyUtils.Funds(TransactionReasonsRP0.Subsidy, MaintenanceHandler.GetAverageSubsidyForPeriod(deltaTime)) * (1d / 365.25d);
             double fundDelta = Math.Min(0d, MaintenanceHandler.Instance.UpkeepPerDayForDisplay + averageSubsidyPerDay) * deltaTime * (1d / 86400d)
                 + GetConstructionCostOverTime(deltaTime) + GetReconRolloutCostOverTime(deltaTime)
diff --git a/Source/RP0/UI/KCT/GUI_NewLC.cs b/Source/RP0/UI/KCT/GUI_NewLC.cs
index 1f33a4bcb85..a815d445bb8 100644
--- a/Source/RP0/UI/KCT/GUI_NewLC.cs
+++ b/Source/RP0/UI/KCT/GUI_NewLC.cs
@@ -450,7 +450,7 @@ public static void DrawNewLCWindow(int windowID)
                 GUILayout.Label(new GUIContent(sBuildTime, "At 100% work rate"), GetLabelRightAlignStyle());
                 GUILayout.EndHorizontal();
 
-                double projectedMaintenance = MaintenanceHandler.Instance.ComputeDailyMaintenanceCost(totalCostForMaintenance, isHangar ? FacilityMaintenanceType.Hangar : FacilityMaintenanceType.LC);
+                double projectedMaintenance = MaintenanceHandler.Instance?.ComputeDailyMaintenanceCost(totalCostForMaintenance, isHangar ? FacilityMaintenanceType.Hangar : FacilityMaintenanceType.LC) ?? 0;
 
                 if (projectedMaintenance > 0d)
                 {
@@ -580,7 +580,12 @@ private static void ProcessNewLC(bool isModify, double curPadCost, double totalC
                     if (isModify)
                         activeLC.Modify(_newLCData, Guid.NewGuid());
                     else
-                        SpaceCenterManagement.Instance.ActiveSC.LaunchComplexes.Add(new LaunchComplex(_newLCData, SpaceCenterManagement.Instance.ActiveSC));
+                    {
+                        SpaceCenterManagement.Instance.ActiveSC.LaunchComplexes.Add(new LaunchComplex(_newLCData, SpaceCenterManagement.Instance.ActiveSC)
+                        {
+                            IsOperational = true
+                        });
+                    }
                 }
                 else
                 {
diff --git a/Source/RP0/UI/KCT/GUI_Personnel.cs b/Source/RP0/UI/KCT/GUI_Personnel.cs
index 33ad28fe63c..55387d115f1 100644
--- a/Source/RP0/UI/KCT/GUI_Personnel.cs
+++ b/Source/RP0/UI/KCT/GUI_Personnel.cs
@@ -45,21 +45,24 @@ private static void DrawPersonnelWindow(int windowID)
             GUILayout.Label(SpaceCenterManagement.Instance.Applicants.ToString("N0"), GetLabelRightAlignStyle());
             GUILayout.EndHorizontal();
 
-            double salaryE = -CurrencyUtils.Funds(TransactionReasonsRP0.SalaryEngineers, -MaintenanceHandler.Instance.IntegrationSalaryPerDay * 365.25d);
-            GUILayout.BeginHorizontal();
-            GUILayout.Label("Total Engineers:", GUILayout.Width(120));
-            GUILayout.Label(SpaceCenterManagement.Instance.TotalEngineers.ToString("N0"), GetLabelRightAlignStyle(), GUILayout.Width(60));
-            GUILayout.Label("Salary and Facilities:", GetLabelRightAlignStyle(), GUILayout.Width(150));
-            GUILayout.Label($"√{salaryE:N0}", GetLabelRightAlignStyle());
-            GUILayout.EndHorizontal();
+            if (MaintenanceHandler.Instance != null)
+            {
+                double salaryE = -CurrencyUtils.Funds(TransactionReasonsRP0.SalaryEngineers, -MaintenanceHandler.Instance.IntegrationSalaryPerDay * 365.25d);
+                GUILayout.BeginHorizontal();
+                GUILayout.Label("Total Engineers:", GUILayout.Width(120));
+                GUILayout.Label(SpaceCenterManagement.Instance.TotalEngineers.ToString("N0"), GetLabelRightAlignStyle(), GUILayout.Width(60));
+                GUILayout.Label("Salary and Facilities:", GetLabelRightAlignStyle(), GUILayout.Width(150));
+                GUILayout.Label($"√{salaryE:N0}", GetLabelRightAlignStyle());
+                GUILayout.EndHorizontal();
 
-            double salaryR = -CurrencyUtils.Funds(TransactionReasonsRP0.SalaryResearchers, -MaintenanceHandler.Instance.ResearchSalaryPerDay * 365.25d);
-            GUILayout.BeginHorizontal();
-            GUILayout.Label("Total Researchers:", GUILayout.Width(120));
-            GUILayout.Label(SpaceCenterManagement.Instance.Researchers.ToString("N0"), GetLabelRightAlignStyle(), GUILayout.Width(60));
-            GUILayout.Label("Salary and Facilities:", GetLabelRightAlignStyle(), GUILayout.Width(150));
-            GUILayout.Label($"√{salaryR:N0}", GetLabelRightAlignStyle());
-            GUILayout.EndHorizontal();
+                double salaryR = -CurrencyUtils.Funds(TransactionReasonsRP0.SalaryResearchers, -MaintenanceHandler.Instance.ResearchSalaryPerDay * 365.25d);
+                GUILayout.BeginHorizontal();
+                GUILayout.Label("Total Researchers:", GUILayout.Width(120));
+                GUILayout.Label(SpaceCenterManagement.Instance.Researchers.ToString("N0"), GetLabelRightAlignStyle(), GUILayout.Width(60));
+                GUILayout.Label("Salary and Facilities:", GetLabelRightAlignStyle(), GUILayout.Width(150));
+                GUILayout.Label($"√{salaryR:N0}", GetLabelRightAlignStyle());
+                GUILayout.EndHorizontal();
+            }
 
             GUILayout.BeginHorizontal();
             if (GUILayout.Button("Engineers")) { _personnelWindowHolder = 0; _personnelPosition.height = 1; }
@@ -468,7 +471,8 @@ private static string GetAssignText(bool add, LaunchComplex currentLC, out int m
             if (add)
             {
                 signChar = "+";
-                limit = Math.Min(currentLC.KSC.UnassignedEngineers, currentLC.MaxEngineers - currentLC.Engineers);
+                int unassigned = KSPUtils.CurrentGameIsCareer() ? currentLC.KSC.UnassignedEngineers : int.MaxValue;
+                limit = Math.Min(unassigned, currentLC.MaxEngineers - currentLC.Engineers);
             }
             else
             {
diff --git a/Source/RP0/Utilities/KCTUtilities.cs b/Source/RP0/Utilities/KCTUtilities.cs
index 9892374814d..639edbcbd4c 100644
--- a/Source/RP0/Utilities/KCTUtilities.cs
+++ b/Source/RP0/Utilities/KCTUtilities.cs
@@ -1356,7 +1356,7 @@ public static void ChangeEngineers(LaunchComplex currentLC, int delta)
         {
             currentLC.Engineers += delta;
             SCMEvents.OnPersonnelChange.Fire();
-            MaintenanceHandler.Instance.ScheduleMaintenanceUpdate();
+            MaintenanceHandler.Instance?.ScheduleMaintenanceUpdate();
             currentLC.RecalculateBuildRates();
             KCT_GUI.BuildRateForDisplay = null;
         }
@@ -1365,7 +1365,7 @@ public static void ChangeEngineers(LCSpaceCenter ksc, int delta)
         {
             ksc.Engineers += delta;
             SCMEvents.OnPersonnelChange.Fire();
-            MaintenanceHandler.Instance.ScheduleMaintenanceUpdate();
+            MaintenanceHandler.Instance?.ScheduleMaintenanceUpdate();
         }
 
         public static void ChangeResearchers(int delta)