diff --git a/bags.lua b/bags.lua
index 34533a2..dce1b3b 100644
--- a/bags.lua
+++ b/bags.lua
@@ -13,10 +13,10 @@ unified_inventory.register_page("bags", {
 		formspec = formspec.."button[4,2;2,0.5;bag3;Bag 3]"
 		formspec = formspec.."button[6,2;2,0.5;bag4;Bag 4]"
 		formspec = formspec.."listcolors[#00000000;#00000000]"
-		formspec = formspec.."list[detached:"..player_name.."_bags;bag1;0.5,1;1,1;]"
-		formspec = formspec.."list[detached:"..player_name.."_bags;bag2;2.5,1;1,1;]"
-		formspec = formspec.."list[detached:"..player_name.."_bags;bag3;4.5,1;1,1;]"
-		formspec = formspec.."list[detached:"..player_name.."_bags;bag4;6.5,1;1,1;]"
+		formspec = formspec.."list[detached:"..minetest.formspec_escape(player_name).."_bags;bag1;0.5,1;1,1;]"
+		formspec = formspec.."list[detached:"..minetest.formspec_escape(player_name).."_bags;bag2;2.5,1;1,1;]"
+		formspec = formspec.."list[detached:"..minetest.formspec_escape(player_name).."_bags;bag3;4.5,1;1,1;]"
+		formspec = formspec.."list[detached:"..minetest.formspec_escape(player_name).."_bags;bag4;6.5,1;1,1;]"
 		return {formspec=formspec}
 	end,
 })
diff --git a/internal.lua b/internal.lua
index 3696cfc..b352cdb 100644
--- a/internal.lua
+++ b/internal.lua
@@ -76,7 +76,7 @@ function unified_inventory.get_formspec(player, page)
 	formspec = formspec.."label[8.2,0;Page:]"
 	formspec = formspec.."label[9,0;"..page.." of "..pagemax.."]"
 	formspec = formspec.."label[8.2,0.4;Filter:]"
-	formspec = formspec.."label[9,0.4;"..unified_inventory.activefilter[player_name].."]"
+	formspec = formspec.."label[9,0.4;"..minetest.formspec_escape(unified_inventory.activefilter[player_name]).."]"
 	return formspec
 end
 
diff --git a/register.lua b/register.lua
index 7725aaa..f56ed97 100644
--- a/register.lua
+++ b/register.lua
@@ -128,7 +128,7 @@ unified_inventory.register_page("craft", {
 		formspec = formspec.."list[detached:trash;main;7,3;1,1;]"
 		if unified_inventory.is_creative(player_name) then
 			formspec = formspec.."label[0,2.5;Refill:]"
-			formspec = formspec.."list[detached:"..player_name.."refill;main;0,3;1,1;]"
+			formspec = formspec.."list[detached:"..minetest.formspec_escape(player_name).."refill;main;0,3;1,1;]"
 		end
 		return {formspec=formspec}
 	end,
@@ -141,12 +141,12 @@ unified_inventory.register_page("craftguide", {
 		formspec = formspec.."background[0,4.5;8,4;ui_main_inventory.png]"
 		formspec = formspec.."label[0,0;Crafting Guide]"
 		formspec = formspec.."listcolors[#00000000;#00000000]"
-		formspec = formspec.."list[detached:"..player_name.."craftrecipe;output;6,1;1,1;]"
+		formspec = formspec.."list[detached:"..minetest.formspec_escape(player_name).."craftrecipe;output;6,1;1,1;]"
 		formspec = formspec.."label[6,3.35;Method:]"
 		local item_name = unified_inventory.current_item[player_name]
 		local craft = nil
 		if item_name then
-			formspec = formspec.."textarea[0.3,0.6;10,1;;Result: "..item_name..";]"
+			formspec = formspec.."textarea[0.3,0.6;10,1;;Result: "..minetest.formspec_escape(item_name)..";]"
 			local alternates = 0
 			local alternate = unified_inventory.alternate[player_name]
 			local crafts = unified_inventory.crafts_table[item_name]