Attempt to fix "invalid force to a physics body" errors. Haven't been able to consistently reproduce the errors, but I'm pretty sure it was caused by GetCenterOfMass returning invalid values when all character's limbs are disabled (may happen for example when a character that's far away from the client's character dies).

Barotrauma/BarotraumaShared/Source/Characters/Animation/FishAnimController.cs

@@ -400,9 +400,27 @@ namespace Barotrauma
 
             foreach (Limb limb in Limbs)
             {
-                if (limb.type == LimbType.Head || limb.type == LimbType.Tail || limb.IsSevered) continue;
+                if (limb.type == LimbType.Head || limb.type == LimbType.Tail || limb.IsSevered || !limb.body.Enabled) continue;
+                if (limb.Mass <= 0.0f)
+                {
+                    string errorMsg = "Creature death animation error: invalid limb mass on character \"" + character.SpeciesName + "\" (type: " + limb.type + ", mass: " + limb.Mass + ")";
+                    DebugConsole.ThrowError(errorMsg);
+                    GameAnalyticsManager.AddErrorEventOnce("FishAnimController.UpdateDying:InvalidMass" + character.ID, GameAnalyticsSDK.Net.EGAErrorSeverity.Error, errorMsg);
+                    deathAnimTimer = deathAnimDuration;
+                    return;
+                }
 
-                limb.body.ApplyForce((centerOfMass - limb.SimPosition) * (float)(Math.Sin(walkPos) * Math.Sqrt(limb.Mass)) * 10.0f);
+                Vector2 diff = (centerOfMass - limb.SimPosition);
+                if (!MathUtils.IsValid(diff))
+                {
+                    string errorMsg = "Creature death animation error: invalid diff (center of mass: " + centerOfMass + ", limb position: " + limb.SimPosition + ")";
+                    DebugConsole.ThrowError(errorMsg);
+                    GameAnalyticsManager.AddErrorEventOnce("FishAnimController.UpdateDying:InvalidDiff" + character.ID, GameAnalyticsSDK.Net.EGAErrorSeverity.Error, errorMsg);
+                    deathAnimTimer = deathAnimDuration;
+                    return;
+                }
+
+                limb.body.ApplyForce(diff * (float)(Math.Sin(walkPos) * Math.Sqrt(limb.Mass)) * 10.0f);
             }
         }
 

Barotrauma/BarotraumaShared/Source/Characters/Animation/Ragdoll.cs

@@ -711,6 +711,12 @@ namespace Barotrauma
 
         public Vector2 GetCenterOfMass()
         {
+            //all limbs disabled -> use the position of the collider
+            if (!Limbs.Any(l => !l.IsSevered && l.body.Enabled))
+            {
+                return Collider.SimPosition;
+            }
+
             Vector2 centerOfMass = Vector2.Zero;
             float totalMass = 0.0f;
             foreach (Limb limb in Limbs)
@@ -719,9 +725,17 @@ namespace Barotrauma
                 centerOfMass += limb.Mass * limb.SimPosition;
                 totalMass += limb.Mass;
             }
-
             centerOfMass /= totalMass;
 
+            if (!MathUtils.IsValid(centerOfMass))
+            {
+                string errorMsg = "Ragdoll.GetCenterOfMass returned an invalid value (" + centerOfMass + "). Limb positions: {"
+                    + string.Join(", ", limbs.Select(l => l.SimPosition)) + "}, total mass: " + totalMass + ".";
+                DebugConsole.ThrowError(errorMsg);
+                GameAnalyticsManager.AddErrorEventOnce("Ragdoll.GetCenterOfMass", GameAnalyticsSDK.Net.EGAErrorSeverity.Error, errorMsg);
+                return Collider.SimPosition;
+            }
+
             return centerOfMass;
         }