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-rw-r--r--gn3/auth/authorisation/data/phenotypes.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/gn3/auth/authorisation/data/phenotypes.py b/gn3/auth/authorisation/data/phenotypes.py
index db16699..a330d4a 100644
--- a/gn3/auth/authorisation/data/phenotypes.py
+++ b/gn3/auth/authorisation/data/phenotypes.py
@@ -18,7 +18,7 @@ def linked_phenotype_data(
         linked = tuple(tuple(row[key] for key in authkeys)
                        for row in authcursor.fetchall())
         if len(linked) <= 0:
-            return (item for item in tuple())
+            return iter(())
         paramstr = "".join(["(%s, %s, %s, %s)"] * len(linked))
         query = (
             "SELECT spc.SpeciesId, spc.SpeciesName, iset.InbredSetId, "