Fix throwing.

Content.Shared/GameObjects/Components/Projectiles/SharedProjectileComponent.cs

@@ -0,0 +1,45 @@
+using System;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameObjects.Components;
+using Robust.Shared.Physics;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.GameObjects.Components.Projectiles
+{
+    public abstract class SharedProjectileComponent : Component, ICollideSpecial
+    {
+        private bool _ignoreShooter = true;
+        public override string Name => "Projectile";
+        public override uint? NetID => ContentNetIDs.PROJECTILE;
+
+        protected abstract EntityUid Shooter { get; }
+
+        public bool IgnoreShooter
+        {
+            get => _ignoreShooter;
+            set
+            {
+                _ignoreShooter = value;
+                Dirty();
+            }
+        }
+
+        [NetSerializable, Serializable]
+        protected class ProjectileComponentState : ComponentState
+        {
+            public ProjectileComponentState(uint netId, EntityUid shooter, bool ignoreShooter) : base(netId)
+            {
+                Shooter = shooter;
+                IgnoreShooter = ignoreShooter;
+            }
+
+            public EntityUid Shooter { get; }
+            public bool IgnoreShooter { get; }
+        }
+
+        public bool PreventCollide(IPhysBody collidedwith)
+        {
+            return IgnoreShooter && collidedwith.Owner.Uid == Shooter;
+        }
+    }
+}