diff --git a/resources/[inventory]/cs_shops/config/functions/sv_function.lua b/resources/[inventory]/cs_shops/config/functions/sv_function.lua
index 94267b8c1..92817367f 100644
--- a/resources/[inventory]/cs_shops/config/functions/sv_function.lua
+++ b/resources/[inventory]/cs_shops/config/functions/sv_function.lua
@@ -99,12 +99,17 @@ function AddItem(source, item, amount, metadata)
         exports['ox_inventory']:AddItem(source, item, amount, metadata)
     elseif GetResourceState('qs-inventory') == 'started' then
         exports['qs-inventory']:AddItem(source, item, amount, false, metadata)
-    elseif GetResourceState('tgiann-inventory') == 'started' then
-        -- Check if the item is a weapon and ensure 'serie' exists in metadata
-        if string.match(item, "WEAPON_") and not metadata.serie then
+elseif GetResourceState('tgiann-inventory') == 'started' then
+    -- Ensure metadata is a table
+    metadata = metadata or {}
+    
+    -- Check if the item is a weapon and ensure 'serie' exists in metadata as a string
+    if string.match(item:upper(), "WEAPON_") then
+        if not metadata.serie or type(metadata.serie) ~= "string" then
             metadata.serie = tostring(math.random(100000, 999999))
         end
-        exports["tgiann-inventory"]:AddItem(source, item, amount, nil, metadata, nil)
+    end
+    exports["tgiann-inventory"]:AddItem(source, item, amount, nil, metadata, nil)
     elseif GetResourceState('origen_inventory') == 'started' then
         exports['origen_inventory']:addItem(source, item, amount, metadata, false)
     else