diff --git a/OpenRA.Mods.Cnc/Activities/HarvesterDockSequence.cs b/OpenRA.Mods.Cnc/Activities/HarvesterDockSequence.cs
index 4c827722e1..69c6aa2e21 100644
--- a/OpenRA.Mods.Cnc/Activities/HarvesterDockSequence.cs
+++ b/OpenRA.Mods.Cnc/Activities/HarvesterDockSequence.cs
@@ -54,8 +54,9 @@ namespace OpenRA.Mods.Cnc
 				case State.Dock:
 					ru.PlayCustomAnimation(self, "dock", () => {
 						ru.PlayCustomAnimRepeating(self, "dock-loop");
-						foreach (var nd in proc.TraitsImplementing<INotifyDocking>())
-							nd.Docked(proc, self);
+						if (proc.IsInWorld && !proc.IsDead())
+							foreach (var nd in proc.TraitsImplementing<INotifyDocking>())
+								nd.Docked(proc, self);
 						state = State.Loop;
 					});
 					state = State.Wait;
@@ -66,8 +67,9 @@ namespace OpenRA.Mods.Cnc
 					return this;
 				case State.Undock:
 					ru.PlayCustomAnimBackwards(self, "dock", () => state = State.DragOut);
-					foreach (var nd in proc.TraitsImplementing<INotifyDocking>())
-						nd.Undocked(proc, self);
+					if (proc.IsInWorld && !proc.IsDead())
+						foreach (var nd in proc.TraitsImplementing<INotifyDocking>())
+							nd.Undocked(proc, self);
 					state = State.Wait;
 					return this;
 				case State.DragOut:
@@ -87,4 +89,4 @@ namespace OpenRA.Mods.Cnc
 			yield return Target.FromActor(proc);
 		}
 	}
-}
\ No newline at end of file
+}
diff --git a/OpenRA.Mods.RA/Activities/RAHarvesterDockSequence.cs b/OpenRA.Mods.RA/Activities/RAHarvesterDockSequence.cs
index ca9d2c1517..f04bf6a317 100644
--- a/OpenRA.Mods.RA/Activities/RAHarvesterDockSequence.cs
+++ b/OpenRA.Mods.RA/Activities/RAHarvesterDockSequence.cs
@@ -47,8 +47,9 @@ namespace OpenRA.Mods.RA
 				case State.Dock:
 					ru.PlayCustomAnimation(self, "dock", () => {
 						ru.PlayCustomAnimRepeating(self, "dock-loop");
-						foreach (var nd in proc.TraitsImplementing<INotifyDocking>())
-							nd.Docked(proc, self);
+						if (proc.IsInWorld && !proc.IsDead())
+							foreach (var nd in proc.TraitsImplementing<INotifyDocking>())
+								nd.Docked(proc, self);
 						state = State.Loop;
 					});
 					state = State.Wait;
@@ -64,8 +65,9 @@ namespace OpenRA.Mods.RA
 				case State.Complete:
 					harv.LastLinkedProc = harv.LinkedProc;
 					harv.LinkProc(self, null);
-					foreach (var nd in proc.TraitsImplementing<INotifyDocking>())
-						nd.Undocked(proc, self);
+					if (proc.IsInWorld && !proc.IsDead())
+						foreach (var nd in proc.TraitsImplementing<INotifyDocking>())
+							nd.Undocked(proc, self);
 					return NextActivity;
 			}