diff --git a/asset.py b/asset.py
index 9d4ca63..98286af 100644
--- a/asset.py
+++ b/asset.py
@@ -853,20 +853,19 @@ class Asset(SymbolMixin, ModelSQL, ModelView):
         cursor = Transaction().connection.cursor()
 
         result = {x: {y.id: None for y in assets} for x in names}
+        if assets:
+            query = cls.get_identifier_sql(tab_asset)
+            query.where = tab_asset.id.in_([x.id for x in assets])
 
-        query = cls.get_identifier_sql(tab_asset)
-        query.where = tab_asset.id.in_([x.id for x in assets])
+            cursor.execute(*query)
+            l1 = cursor.fetchall()
 
-        cursor.execute(*query)
-        l1 = cursor.fetchall()
-
-        for x in l1:
-            (id1, wkn, secsymb, isin) = x
-            r1 = {'wkn': wkn, 'secsymb': secsymb, 'isin': isin}
-
-            for n in names:
-                result[n][id1] = r1[n]
+            for x in l1:
+                (id1, wkn, secsymb, isin) = x
+                r1 = {'wkn': wkn, 'secsymb': secsymb, 'isin': isin}
 
+                for n in names:
+                    result[n][id1] = r1[n]
         return result
 
     def get_rec_name(self, name):