Pool Recycling error 2 sprites collides at the same time to a sprite

Pool Recycling error 2 sprites collides at the same time to a sprite

I have a shooting game where, you shoot two bullets at the opposite
direction, so happens that if an enemy gets close to the starting point of
the bullet(enemy is in the area of the bullet starting point) a error
happens,
here is my code:
if((_target.collidesWith(bullet))){
resourcesManager.enemyPool.recyclePoolItem(_target);
targets.remove();
score=score+1;
}
if((_target.collidesWith(bullet2))){
resourcesManager.enemyPool.recyclePoolItem(_target);
targets.remove();
score=score+1;
break;
}
Error Log:
09-30 09:47:23.530: E/AndroidRuntime(1167): in writeCrashedAppName,
pkgName :com.www.tangent
09-30 09:47:23.550: I/Process(1167): Sending signal. PID: 1167 SIG: 9
09-30 09:47:23.550: E/AndroidRuntime(1167): FATAL EXCEPTION: UpdateThread
09-30 09:47:23.550: E/AndroidRuntime(1167): java.lang.IllegalStateException
09-30 09:47:23.550: E/AndroidRuntime(1167): at
java.util.LinkedList$LinkIterator.remove(LinkedList.java:164)
09-30 09:47:23.550: E/AndroidRuntime(1167): at
com.www.scene.WeaponSelectScene$1.onUpdate(WeaponSelectScene.java:318)
09-30 09:47:23.550: E/AndroidRuntime(1167): at
org.andengine.engine.handler.UpdateHandlerList.onUpdate(UpdateHandlerList.java:47)
09-30 09:47:23.550: E/AndroidRuntime(1167): at
org.andengine.entity.Entity.onManagedUpdate(Entity.java:1395)
09-30 09:47:23.550: E/AndroidRuntime(1167): at
org.andengine.entity.scene.Scene.onManagedUpdate(Scene.java:284)
09-30 09:47:23.550: E/AndroidRuntime(1167): at
org.andengine.entity.Entity.onUpdate(Entity.java:1167)
09-30 09:47:23.550: E/AndroidRuntime(1167): at
org.andengine.entity.scene.Scene.onManagedUpdate(Scene.java:288)
09-30 09:47:23.550: E/AndroidRuntime(1167): at
org.andengine.entity.Entity.onUpdate(Entity.java:1167)
09-30 09:47:23.550: E/AndroidRuntime(1167): at
org.andengine.engine.Engine.onUpdateScene(Engine.java:591)
09-30 09:47:23.550: E/AndroidRuntime(1167): at
org.andengine.engine.Engine.onUpdate(Engine.java:586)
09-30 09:47:23.550: E/AndroidRuntime(1167): at
org.andengine.engine.LimitedFPSEngine.onUpdate(LimitedFPSEngine.java:56)
09-30 09:47:23.550: E/AndroidRuntime(1167): at
org.andengine.engine.Engine.onTickUpdate(Engine.java:548)
09-30 09:47:23.550: E/AndroidRuntime(1167): at
org.andengine.engine.Engine$UpdateThread.run(Engine.java:820)
09-30 09:47:23.570: I/BstWindowOrientationListener(521):
getCurrentRotation(0)
09-30 09:47:23.570: I/ActivityManager(521): Process com.www.tangent (pid
1167) has died.
09-30 09:47:23.570: I/WindowManager(521): WIN DEATH: Window{b4846b48
SurfaceView paused=false}
09-30 09:47:23.590: E/InputDispatcher(521): channel 'b472fa40
com.www.tangent/com.www.tangent.GameActivity (server)' ~ Consumer closed
input channel or an error occurred. events=0x8
09-30 09:47:23.590: E/InputDispatcher(521): channel 'b472fa40
com.www.tangent/com.www.tangent.GameActivity (server)' ~ Channel is
unrecoverably broken and will be disposed!
09-30 09:47:23.590: I/WindowManager(521): WIN DEATH: Window{b472fa40
com.www.tangent/com.www.tangent.GameActivity paused=false}