From 0961f25a3ccbdb7bd556f9159b2574d8082a625a Mon Sep 17 00:00:00 2001
From: bluefireoly <bluefireolymp@gmail.com>
Date: Fri, 29 Jan 2021 13:44:02 +0100
Subject: [PATCH] Fix ConcurrentModificationException (issue #12 )

---
 .../axay/kspigot/extensions/bukkit/InventoryExtensions.kt  | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/main/kotlin/net/axay/kspigot/extensions/bukkit/InventoryExtensions.kt b/src/main/kotlin/net/axay/kspigot/extensions/bukkit/InventoryExtensions.kt
index 8d90cc2b..198db94a 100644
--- a/src/main/kotlin/net/axay/kspigot/extensions/bukkit/InventoryExtensions.kt
+++ b/src/main/kotlin/net/axay/kspigot/extensions/bukkit/InventoryExtensions.kt
@@ -3,7 +3,10 @@ package net.axay.kspigot.extensions.bukkit
 import org.bukkit.event.inventory.InventoryAction
 import org.bukkit.inventory.Inventory
 
-fun Inventory.closeForViewers() = viewers.forEach { it.closeInventory() }
+/**
+ * Closes the inventory for all viewers.
+ */
+fun Inventory.closeForViewers() = HashSet(viewers).forEach { it.closeInventory() }
 
 /**
  * @return True, if the action was a simple inventory click.
@@ -15,4 +18,4 @@ val InventoryAction.isSimple
         InventoryAction.PICKUP_ALL, InventoryAction.PICKUP_HALF, InventoryAction.PICKUP_ONE
         -> true
         else -> false
-    }
\ No newline at end of file
+    }