diff --git a/inventory-app/common.py b/inventory-app/common.py
index 087026d..8490388 100644
--- a/inventory-app/common.py
+++ b/inventory-app/common.py
@@ -99,9 +99,7 @@ def build_query(base_query, fields=[], sort_fields={}):
     q = base_query.copy()
     for attr, title, tp in fields:
         key = attr.replace(".", "_")
-        if key in ("inventory_owner_username", "inventory_user_username"):
-            val = request.args.get(key, type=dict)
-        elif tp == list:
+        if tp == list:
             val = request.args.getlist(key)
             val = list(map(str, val))
         else:
diff --git a/inventory-app/inventory.py b/inventory-app/inventory.py
index 43370b0..ab6e3b5 100644
--- a/inventory-app/inventory.py
+++ b/inventory-app/inventory.py
@@ -355,8 +355,8 @@ def view_inventory(slug=None):
         template = "inventory_public.html"
         public_view = True
     else:
-        fields.append(("inventory.owner.username", "Owner", list))
-        fields.append(("inventory.user.username", "User", list))
+        fields.append(("inventory.owner.username", "Owner", str))
+        fields.append(("inventory.user.username", "User", str))
     if slug and not public_view:
         template = "inventory_pick.html"
         if request.path.startswith("/m/inventory/clone-with-slug"):