diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/client/screen/ItemMonitorScreen.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/client/screen/ItemMonitorScreen.kt
index 88542bfd8..aa29e2418 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/client/screen/ItemMonitorScreen.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/client/screen/ItemMonitorScreen.kt
@@ -15,6 +15,14 @@ import ru.dbotthepony.mc.otm.menu.ItemMonitorMenu
 import ru.dbotthepony.mc.otm.next
 import ru.dbotthepony.mc.otm.prev
 
+private fun div(a: Int, b: Int): Int {
+	if (a % b == 0) {
+		return a / b - 1
+	}
+
+	return a / b
+}
+
 class ItemMonitorScreen(menu: ItemMonitorMenu, inventory: Inventory, title: Component) :
 	MatteryScreen<ItemMonitorMenu>(menu, inventory, title) {
 
@@ -34,7 +42,7 @@ class ItemMonitorScreen(menu: ItemMonitorMenu, inventory: Inventory, title: Comp
 		frame.width = 178f + frame.dockPadding.left + frame.dockPadding.right
 
 		val viewScrollBar = ScrollBarPanel(this, topPanel, 28f + ITEM_GRID_WIDTH * 18f + 2f, 16f, ITEM_GRID_HEIGHT * 18f)
-		viewScrollBar.setupRowMultiplier { menu.view.itemCount / ITEM_GRID_WIDTH }
+		viewScrollBar.setupRowMultiplier { div(menu.view.itemCount, ITEM_GRID_WIDTH) }
 
 		viewScrollBar.dock = Dock.RIGHT
 		viewScrollBar.setDockMargin(left = 2f)
@@ -45,7 +53,7 @@ class ItemMonitorScreen(menu: ItemMonitorMenu, inventory: Inventory, title: Comp
 		for (i in 0 until ITEM_GRID_WIDTH * ITEM_GRID_HEIGHT) {
 			object : AbstractSlotPanel(this@ItemMonitorScreen, gridPanel) {
 				override fun getItemStack(): ItemStack {
-					val index = i + viewScrollBar.getScroll(menu.view.itemCount / ITEM_GRID_WIDTH) * ITEM_GRID_WIDTH
+					val index = i + viewScrollBar.getScroll(div(menu.view.itemCount, ITEM_GRID_WIDTH)) * ITEM_GRID_WIDTH
 					return menu.view.sortedView.getOrNull(index)?.stack ?: ItemStack.EMPTY
 				}
 
@@ -54,7 +62,7 @@ class ItemMonitorScreen(menu: ItemMonitorMenu, inventory: Inventory, title: Comp
 				}
 
 				override fun mouseClickedInner(mouse_x: Double, mouse_y: Double, mouse_click_type: Int): Boolean {
-					val index = i + viewScrollBar.getScroll(menu.view.itemCount / ITEM_GRID_WIDTH) * ITEM_GRID_WIDTH
+					val index = i + viewScrollBar.getScroll(div(menu.view.itemCount, ITEM_GRID_WIDTH)) * ITEM_GRID_WIDTH
 					menu.view.mouseClick(index, mouse_click_type)
 					return true
 				}