--- ../src-base/minecraft/net/minecraft/entity/monster/EntitySpider.java
+++ ../src-work/minecraft/net/minecraft/entity/monster/EntitySpider.java
@@ -14,6 +14,8 @@
 import net.minecraft.world.EnumDifficulty;
 import net.minecraft.world.World;
 
+import org.bukkit.event.entity.EntityTargetEvent; // CraftBukkit
+
 public class EntitySpider extends EntityMob
 {
     private static final String __OBFID = "CL_00001699";
@@ -88,7 +90,25 @@
 
         if (f1 > 0.5F && this.rand.nextInt(100) == 0)
         {
-            this.entityToAttack = null;
+            // CraftBukkit start
+            EntityTargetEvent event = new EntityTargetEvent(this.getBukkitEntity(), null, EntityTargetEvent.TargetReason.FORGOT_TARGET);
+            this.worldObj.getServer().getPluginManager().callEvent(event);
+
+            if (!event.isCancelled())
+            {
+                if (event.getTarget() == null)
+                {
+                    this.entityToAttack = null;
+                }
+                else
+                {
+                    this.entityToAttack = ((org.bukkit.craftbukkit.entity.CraftEntity) event.getTarget()).getHandle();
+                }
+
+                return;
+            }
+
+            // CraftBukkit end
         }
         else
         {
