diff --git a/lib/invoice/db/base.py b/lib/invoice/db/base.py
index 62838a4..94d8cdd 100644
--- a/lib/invoice/db/base.py
+++ b/lib/invoice/db/base.py
@@ -72,7 +72,7 @@ class List:
         if isinstance(selector, str):
             selector = {"name": selector}
         if isinstance(selector, int):
-            selector = {"number": number}
+            selector = {"number": selector}
         log.debug("Selecting: {}".format(selector))
         assert isinstance(selector, dict)
         return [item for item in self if all(getattr(item, key) == selector[key] for key in selector)]
diff --git a/lib/invoice/db/invoices.py b/lib/invoice/db/invoices.py
index 3b8abe3..5c55f92 100644
--- a/lib/invoice/db/invoices.py
+++ b/lib/invoice/db/invoices.py
@@ -30,10 +30,14 @@ Item: 0000: Item summary
     def _select(self, selector):
         if isinstance(selector, str):
             match = self._regex.match(selector)
-            if not match:
-                raise ItemNotFoundError("Item not found: {}".format(selector))
-            selector = match.groupdict()
-            selector["number"] = int(selector["number"])
+            if match:
+                selector = match.groupdict()
+                selector["number"] = int(selector["number"])
+            else:
+                try:
+                    selector = int(selector)
+                except TypeError:
+                    raise ItemNotFoundError("Item not found: {}".format(selector))
         return super(Invoices, self)._select(selector)
 
     def new(self, company_name):