diff --git a/Barotrauma/BarotraumaClient/Source/Characters/Animation/Ragdoll.cs b/Barotrauma/BarotraumaClient/Source/Characters/Animation/Ragdoll.cs
index 5c3dd9749..c6f95eda7 100644
--- a/Barotrauma/BarotraumaClient/Source/Characters/Animation/Ragdoll.cs
+++ b/Barotrauma/BarotraumaClient/Source/Characters/Animation/Ragdoll.cs
@@ -210,7 +210,9 @@ namespace Barotrauma
                     else
                     {
                         Vector2 positionError = serverPos.Position - localPos.Position;
-                        float rotationError = serverPos.Rotation - localPos.Rotation;
+                        float rotationError = serverPos.Rotation.HasValue && localPos.Rotation.HasValue ?
+                            serverPos.Rotation.Value - localPos.Rotation.Value :
+                            0.0f;
 
                         for (int i = localPosIndex; i < character.MemLocalState.Count; i++)
                         {
diff --git a/Barotrauma/BarotraumaClient/Source/Characters/CharacterNetworking.cs b/Barotrauma/BarotraumaClient/Source/Characters/CharacterNetworking.cs
index 54acd801e..c53b261fa 100644
--- a/Barotrauma/BarotraumaClient/Source/Characters/CharacterNetworking.cs
+++ b/Barotrauma/BarotraumaClient/Source/Characters/CharacterNetworking.cs
@@ -214,8 +214,8 @@ namespace Barotrauma
                         msg.ReadRangedSingle(-MaxVel, MaxVel, 12));
 
                     bool fixedRotation = msg.ReadBoolean();
-                    float rotation = AnimController.Collider.Rotation;
-                    float angularVelocity = AnimController.Collider.AngularVelocity;
+                    float? rotation = null;
+                    float? angularVelocity = null;
                     if (!fixedRotation)
                     {
                         rotation = msg.ReadFloat();
diff --git a/Barotrauma/BarotraumaClient/Source/Physics/PhysicsBody.cs b/Barotrauma/BarotraumaClient/Source/Physics/PhysicsBody.cs
index 1fc27d949..f231c83a0 100644
--- a/Barotrauma/BarotraumaClient/Source/Physics/PhysicsBody.cs
+++ b/Barotrauma/BarotraumaClient/Source/Physics/PhysicsBody.cs
@@ -150,10 +150,10 @@ namespace Barotrauma
             float MaxAngularVel     = NetConfig.MaxPhysicsBodyAngularVelocity;
 
             Vector2 newPosition         = SimPosition;
-            float newRotation           = Rotation;
+            float? newRotation          = null;
             bool awake                  = body.Awake;
             Vector2 newVelocity         = LinearVelocity;
-            float newAngularVelocity    = AngularVelocity;
+            float? newAngularVelocity   = null;
 
             newPosition = new Vector2(
                 msg.ReadFloat(), 
@@ -179,12 +179,12 @@ namespace Barotrauma
             msg.ReadPadBits();
 
             if (!MathUtils.IsValid(newPosition) || 
-                !MathUtils.IsValid(newRotation) ||
                 !MathUtils.IsValid(newVelocity) ||
-                !MathUtils.IsValid(newAngularVelocity))
+                (newRotation.HasValue && !MathUtils.IsValid(newRotation.Value)) ||
+                (newAngularVelocity.HasValue && !MathUtils.IsValid(newAngularVelocity.Value)))
             {
                 string errorMsg = "Received invalid position data for \"" + parentDebugName
-                    + "\" (position: " + newPosition + ", rotation: " + newRotation + ", velocity: " + newVelocity + ", angular velocity: " + newAngularVelocity + ")";
+                    + "\" (position: " + newPosition + ", rotation: " + (newRotation ?? 0) + ", velocity: " + newVelocity + ", angular velocity: " + (newAngularVelocity ?? 0) + ")";
 #if DEBUG
                 DebugConsole.ThrowError(errorMsg);
 #endif
diff --git a/Barotrauma/BarotraumaServer/Source/Networking/GameServer.cs b/Barotrauma/BarotraumaServer/Source/Networking/GameServer.cs
index 8e1165135..4ea71904f 100644
--- a/Barotrauma/BarotraumaServer/Source/Networking/GameServer.cs
+++ b/Barotrauma/BarotraumaServer/Source/Networking/GameServer.cs
@@ -43,6 +43,7 @@ namespace Barotrauma.Networking
         private IRestResponse masterServerResponse;
 
         private bool autoRestartTimerRunning;
+        private float endRoundTimer;
 
         public VoipServer VoipServer
         {
@@ -405,20 +406,38 @@ namespace Barotrauma.Networking
                     }
                 }
 
+                if (isCrewDead && respawnManager == null)
+                {
+                    if (endRoundTimer <= 0.0f)
+                    {
+                        SendChatMessage(TextManager.Get("CrewDeadNoRespawns").Replace("[time]", "60"), ChatMessageType.Server);
+                    }
+                    endRoundTimer += deltaTime;
+                }
+                else
+                {
+                    endRoundTimer = 0.0f;
+                }
+
                 //restart if all characters are dead or submarine is at the end of the level
                 if ((serverSettings.AutoRestart && isCrewDead)
                     ||
-                    (serverSettings.EndRoundAtLevelEnd && subAtLevelEnd))
+                    (serverSettings.EndRoundAtLevelEnd && subAtLevelEnd)
+                    ||
+                    (isCrewDead && respawnManager == null && endRoundTimer >= 60.0f))
                 {
                     if (serverSettings.AutoRestart && isCrewDead)
                     {
                         Log("Ending round (entire crew dead)", ServerLog.MessageType.ServerMessage);
                     }
-                    else
+                    else if (serverSettings.EndRoundAtLevelEnd && subAtLevelEnd)
                     {
                         Log("Ending round (submarine reached the end of the level)", ServerLog.MessageType.ServerMessage);
                     }
-
+                    else
+                    {
+                        Log("Ending round (no living players left and respawning is not enabled during this round)", ServerLog.MessageType.ServerMessage);
+                    }
                     EndGame();
                     return;
                 }
@@ -1630,9 +1649,23 @@ namespace Barotrauma.Networking
             Rand.SetSyncedSeed(roundStartSeed);
 
             int teamCount = 1;
-            MultiPlayerCampaign campaign = GameMain.NetLobbyScreen.SelectedMode == GameMain.GameSession?.GameMode.Preset ?
+            MultiPlayerCampaign campaign = selectedMode == GameMain.GameSession?.GameMode.Preset ?
                 GameMain.GameSession?.GameMode as MultiPlayerCampaign : null;
 
+            if (campaign != null && campaign.Map == null)
+            {
+                initiatedStartGame = false;
+                startGameCoroutine = null;
+                string errorMsg = "Starting the round failed. Campaign was still active, but the map has been disposed. Try selecting another game mode.";
+                DebugConsole.ThrowError(errorMsg);
+                GameAnalyticsManager.AddErrorEventOnce("GameServer.StartGame:InvalidCampaignState", GameAnalyticsSDK.Net.EGAErrorSeverity.Error, errorMsg);
+                if (OwnerConnection != null)
+                {
+                    SendDirectChatMessage(errorMsg, connectedClients.Find(c => c.Connection == OwnerConnection), ChatMessageType.Error);
+                }
+                yield return CoroutineStatus.Failure;
+            }
+
             //don't instantiate a new gamesession if we're playing a campaign
             if (campaign == null || GameMain.GameSession == null)
             {
@@ -1891,6 +1924,8 @@ namespace Barotrauma.Networking
 
             Mission mission = GameMain.GameSession.Mission;
             GameMain.GameSession.GameMode.End(endMessage);
+            
+            endRoundTimer = 0.0f;
 
             if (serverSettings.AutoRestart)
             {
diff --git a/Barotrauma/BarotraumaServer/Source/Networking/GameServerLogin.cs b/Barotrauma/BarotraumaServer/Source/Networking/GameServerLogin.cs
index fe0b66db2..630c09a08 100644
--- a/Barotrauma/BarotraumaServer/Source/Networking/GameServerLogin.cs
+++ b/Barotrauma/BarotraumaServer/Source/Networking/GameServerLogin.cs
@@ -158,7 +158,7 @@ namespace Barotrauma.Networking
             }
 
             //kick connected client if status becomes invalid (e.g. VAC banned, not connected to steam)
-            if (status != Facepunch.Steamworks.ServerAuth.Status.OK && GameMain.Config.RequireSteamAuthentication)
+            /*if (status != Facepunch.Steamworks.ServerAuth.Status.OK && GameMain.Config.RequireSteamAuthentication)
             {
                 var connectedClient = connectedClients.Find(c => c.SteamID == ownerID);
                 if (connectedClient != null)
@@ -166,7 +166,7 @@ namespace Barotrauma.Networking
                     Log("Disconnecting client " + connectedClient.Name + " (Steam ID: " + steamID + "). Steam authentication no longer valid (" + status + ").", ServerLog.MessageType.ServerMessage);                    
                     KickClient(connectedClient, $"DisconnectMessage.SteamAuthNoLongerValid_[status]={status.ToString()}");
                 }
-            }
+            }*/
         }
 
         private bool IsServerOwner(NetIncomingMessage inc, NetConnection senderConnection)
diff --git a/Barotrauma/BarotraumaShared/Source/Characters/CharacterNetworking.cs b/Barotrauma/BarotraumaShared/Source/Characters/CharacterNetworking.cs
index f0b5af9d2..500b69c5e 100644
--- a/Barotrauma/BarotraumaShared/Source/Characters/CharacterNetworking.cs
+++ b/Barotrauma/BarotraumaShared/Source/Characters/CharacterNetworking.cs
@@ -13,17 +13,17 @@ namespace Barotrauma
 
         public readonly AnimController.Animation Animation;
 
-        public CharacterStateInfo(Vector2 pos, float rotation, Vector2 velocity, float angularVelocity, float time, Direction dir, Entity interact, AnimController.Animation animation = AnimController.Animation.None)
+        public CharacterStateInfo(Vector2 pos, float? rotation, Vector2 velocity, float? angularVelocity, float time, Direction dir, Entity interact, AnimController.Animation animation = AnimController.Animation.None)
             : this(pos, rotation, velocity, angularVelocity, 0, time, dir, interact, animation)
         {
         }
 
-        public CharacterStateInfo(Vector2 pos, float rotation, UInt16 ID, Direction dir, Entity interact, AnimController.Animation animation = AnimController.Animation.None)
+        public CharacterStateInfo(Vector2 pos, float? rotation, UInt16 ID, Direction dir, Entity interact, AnimController.Animation animation = AnimController.Animation.None)
             : this(pos, rotation, Vector2.Zero, 0.0f, ID, 0.0f, dir, interact, animation)
         {
         }
 
-        protected CharacterStateInfo(Vector2 pos, float rotation, Vector2 velocity, float angularVelocity, UInt16 ID, float time, Direction dir, Entity interact, AnimController.Animation animation = AnimController.Animation.None)
+        protected CharacterStateInfo(Vector2 pos, float? rotation, Vector2 velocity, float? angularVelocity, UInt16 ID, float time, Direction dir, Entity interact, AnimController.Animation animation = AnimController.Animation.None)
             : base(pos, rotation, velocity, angularVelocity, ID, time)
         {
             Direction = dir;
diff --git a/Barotrauma/BarotraumaShared/Source/Physics/PhysicsBody.cs b/Barotrauma/BarotraumaShared/Source/Physics/PhysicsBody.cs
index 9e7228401..d87c6ab3b 100644
--- a/Barotrauma/BarotraumaShared/Source/Physics/PhysicsBody.cs
+++ b/Barotrauma/BarotraumaShared/Source/Physics/PhysicsBody.cs
@@ -18,7 +18,7 @@ namespace Barotrauma
             private set;
         }
 
-        public float Rotation
+        public float? Rotation
         {
             get;
             private set;
@@ -30,7 +30,7 @@ namespace Barotrauma
             private set;
         }
 
-        public float AngularVelocity
+        public float? AngularVelocity
         {
             get;
             private set;
@@ -39,17 +39,17 @@ namespace Barotrauma
         public readonly float Timestamp;
         public readonly UInt16 ID;
 
-        public PosInfo(Vector2 pos, float rotation, Vector2 linearVelocity, float angularVelocity, float time)
+        public PosInfo(Vector2 pos, float? rotation, Vector2 linearVelocity, float? angularVelocity, float time)
             : this(pos, rotation, linearVelocity, angularVelocity, 0, time)
         {
         }
 
-        public PosInfo(Vector2 pos, float rotation, Vector2 linearVelocity, float angularVelocity, UInt16 ID)
+        public PosInfo(Vector2 pos, float? rotation, Vector2 linearVelocity, float? angularVelocity, UInt16 ID)
             : this(pos, rotation, linearVelocity, angularVelocity, ID, 0.0f)
         {
         }
 
-        protected PosInfo(Vector2 pos, float rotation, Vector2 linearVelocity, float angularVelocity, UInt16 ID, float time)
+        protected PosInfo(Vector2 pos, float? rotation, Vector2 linearVelocity, float? angularVelocity, UInt16 ID, float time)
         {
             Position = pos;
             Rotation = rotation;
@@ -775,8 +775,8 @@ namespace Barotrauma
 
             newVelocity = positionBuffer[0].LinearVelocity;
             newPosition = positionBuffer[0].Position;
-            newRotation = positionBuffer[0].Rotation;
-            newAngularVelocity = positionBuffer[0].AngularVelocity;
+            newRotation = positionBuffer[0].Rotation ?? Rotation;
+            newAngularVelocity = positionBuffer[0].AngularVelocity ?? AngularVelocity;
             
             positionBuffer.RemoveAt(0);            
         }