diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/client/screen/MatteryScreen.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/client/screen/MatteryScreen.kt
index b5fc409a3..3c4bcc0cf 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/client/screen/MatteryScreen.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/client/screen/MatteryScreen.kt
@@ -3,6 +3,7 @@ package ru.dbotthepony.mc.otm.client.screen
 import com.mojang.blaze3d.systems.RenderSystem
 import it.unimi.dsi.fastutil.ints.Int2ObjectFunction
 import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap
+import it.unimi.dsi.fastutil.objects.ObjectArrayList
 import net.minecraft.ChatFormatting
 import net.minecraft.client.gui.Font
 import net.minecraft.client.gui.GuiGraphics
@@ -54,6 +55,7 @@ import ru.dbotthepony.mc.otm.menu.widget.LevelGaugeWidget
 import ru.dbotthepony.mc.otm.menu.widget.ProfiledLevelGaugeWidget
 import java.util.*
 import kotlin.collections.ArrayDeque
+import kotlin.collections.ArrayList
 import kotlin.collections.List
 import kotlin.collections.MutableSet
 import kotlin.collections.isNotEmpty
@@ -471,7 +473,7 @@ abstract class MatteryScreen<T : MatteryMenu>(menu: T, inventory: Inventory, tit
 
 	override fun onClose() {
 		super.onClose()
-		panels.forEach { it.markRemoved() }
+		ObjectArrayList(panels).forEach { it.markRemoved() }
 	}
 
 	public override fun recalculateQuickCraftRemaining() {
@@ -506,7 +508,7 @@ abstract class MatteryScreen<T : MatteryMenu>(menu: T, inventory: Inventory, tit
 		var click = false
 		var focusKilled = false
 
-		for (panel in panels) {
+		for (panel in ObjectArrayList(panels)) {
 			if (click || !panel.mouseClickedChecked(x, y, button)) {
 				focusKilled = panel.killFocus() || focusKilled
 			} else {
@@ -525,7 +527,7 @@ abstract class MatteryScreen<T : MatteryMenu>(menu: T, inventory: Inventory, tit
 	private var lastDragSlot: Slot? = null
 
 	override fun mouseDragged(x: Double, y: Double, button: Int, xDelta: Double, yDelta: Double): Boolean {
-		for (panel in panels) {
+		for (panel in ObjectArrayList(panels)) {
 			if (panel.mouseDraggedChecked(x, y, button, xDelta, yDelta)) {
 				if (returnSlot != null) {
 					super.mouseDragged(x, y, button, xDelta, yDelta)
@@ -553,7 +555,7 @@ abstract class MatteryScreen<T : MatteryMenu>(menu: T, inventory: Inventory, tit
 			}
 		}
 
-		for (panel in panels) {
+		for (panel in ObjectArrayList(panels)) {
 			if (panel.mouseReleasedChecked(p_97812_, p_97813_, p_97814_)) {
 				if (returnSlot != null) {
 					super.mouseReleased(p_97812_, p_97813_, p_97814_)
@@ -569,7 +571,7 @@ abstract class MatteryScreen<T : MatteryMenu>(menu: T, inventory: Inventory, tit
 	}
 
 	override fun mouseScrolled(mouseX: Double, mouseY: Double, scrollX: Double, scrollY: Double): Boolean {
-		for (panel in panels) {
+		for (panel in ObjectArrayList(panels)) {
 			if (panel.mouseScrolledChecked(mouseX, mouseY, scrollY)) {
 				return true
 			}
@@ -579,7 +581,7 @@ abstract class MatteryScreen<T : MatteryMenu>(menu: T, inventory: Inventory, tit
 	}
 
 	override fun keyReleased(p_94715_: Int, p_94716_: Int, p_94717_: Int): Boolean {
-		for (panel in panels) {
+		for (panel in ObjectArrayList(panels)) {
 			if (panel.keyReleased(p_94715_, p_94716_, p_94717_)) {
 				return true
 			}
@@ -589,7 +591,7 @@ abstract class MatteryScreen<T : MatteryMenu>(menu: T, inventory: Inventory, tit
 	}
 
 	override fun charTyped(p_94683_: Char, p_94684_: Int): Boolean {
-		for (panel in panels) {
+		for (panel in ObjectArrayList(panels)) {
 			if (panel.charTyped(p_94683_, p_94684_)) {
 				return true
 			}
@@ -599,7 +601,7 @@ abstract class MatteryScreen<T : MatteryMenu>(menu: T, inventory: Inventory, tit
 	}
 
 	override fun keyPressed(key: Int, scancode: Int, mods: Int): Boolean {
-		for (panel in panels) {
+		for (panel in ObjectArrayList(panels)) {
 			if (panel.keyPressed(key, scancode, mods)) {
 				if (returnSlot != null) {
 					super.keyPressed(key, scancode, mods)