diff --git a/src/gui/components/ItemSlot.zig b/src/gui/components/ItemSlot.zig
index 9407c860ac..d9763ec173 100644
--- a/src/gui/components/ItemSlot.zig
+++ b/src/gui/components/ItemSlot.zig
@@ -24,6 +24,11 @@ const Mode = enum {
 	immutable,
 };
 
+const Style = enum {
+	normal,
+	unfocused,
+};
+
 pos: Vec2f,
 size: Vec2f = @splat(sizeWithBorder),
 inventory: ClientInventory,
@@ -36,6 +41,7 @@ pressed: bool = false,
 renderFrame: bool = true,
 texture: ?Texture,
 mode: Mode,
+style: Style,
 
 var defaultTexture: Texture = undefined;
 var immutableTexture: Texture = undefined;
@@ -81,6 +87,7 @@ pub fn init(pos: Vec2f, inventory: ClientInventory, itemSlot: u32, texture: Text
 		.lastItemAmount = amount,
 		.texture = texture.value(),
 		.mode = mode,
+		.style = Style.normal,
 	};
 	self.textSize = self.text.calculateLineBreaks(8, self.size[0] - 2*border);
 	return self;
@@ -136,6 +143,16 @@ pub fn render(self: *ItemSlot, _: Vec2f) void {
 		draw.boundImage(self.pos, self.size);
 	}
 	const item = self.inventory.getItem(self.itemSlot);
+	const inventorySource = self.inventory.super.source;
+
+	const isValidMaterial = item == .null or (item == .baseItem and item.baseItem.material() != null);
+	const applyWorkbenchFocus = gui.isWindowOpen("workbench") and (inventorySource == .playerInventory or inventorySource == .other);
+	if (self.style == .normal and applyWorkbenchFocus and !isValidMaterial) {
+		self.style = .unfocused;
+	} else if (self.style == .unfocused and (!applyWorkbenchFocus or isValidMaterial)) {
+		self.style = .normal;
+	}
+
 	if (item != .null) {
 		item.render(self.pos, self.size, border);
 		const shouldRenderStackSizeText = item.stackSize() > 1 and self.inventory.type != .creative;
@@ -149,6 +166,10 @@ pub fn render(self: *ItemSlot, _: Vec2f) void {
 			const oldColor = draw.setColor(0x300000ff);
 			defer draw.restoreColor(oldColor);
 			draw.rect(self.pos, self.size);
+		} else if (self.style == .unfocused and self.renderFrame) {
+			const oldColor = draw.setColor(0x800f0f0f);
+			defer draw.restoreColor(oldColor);
+			draw.rect(self.pos, self.size);
 		}
 	}
 }
diff --git a/src/gui/windows/workbench.zig b/src/gui/windows/workbench.zig
index 3c11d77072..a6c89cb13d 100644
--- a/src/gui/windows/workbench.zig
+++ b/src/gui/windows/workbench.zig
@@ -62,7 +62,7 @@ fn updateResult(_: main.items.Inventory.Source) void {
 
 fn openInventory() void {
 	craftingGridInv = ClientInventory.init(main.globalAllocator, 25, .serverShared, .{.workbench = .{.playerId = main.game.Player.id, .proceduralItemIndex = proceduralItemTypes.items[currentProceduralItemType]}}, .{.onUpdateCallback = &updateResult, .canPutInto = items.ProceduralItem.canPutIntoWorkbenchCallback});
-	craftingResultInv = ClientInventory.init(main.globalAllocator, 1, .{.workbenchResult = craftingGridInv.super.id}, .other, .{});
+	craftingResultInv = ClientInventory.init(main.globalAllocator, 1, .{.workbenchResult = craftingGridInv.super.id}, .{.workbench = .{.playerId = main.game.Player.id, .proceduralItemIndex = proceduralItemTypes.items[currentProceduralItemType]}}, .{});
 	const list = HorizontalList.init();
 	{ // crafting grid
 		const grid = VerticalList.init(.{0, 0}, 300, 0);
diff --git a/src/items.zig b/src/items.zig
index 1be05698df..5a01aa53ec 100644
--- a/src/items.zig
+++ b/src/items.zig
@@ -1486,7 +1486,7 @@ pub fn registerProceduralItem(assetFolder: []const u8, id: []const u8, zon: ZonE
 	}
 	for (zon.getChild("optional").toSlice(), 0..) |zonDisabled, i| {
 		if (i >= 25) {
-			std.log.err("disabled array of {s} has too many entries", .{id});
+			std.log.err("optional array of {s} has too many entries", .{id});
 			break;
 		}
 		slotInfos[i].optional = (zonDisabled.as(usize) orelse 0) != 0;