diff --git a/spinn_utilities/make_tools/log_sqllite_database.py b/spinn_utilities/make_tools/log_sqllite_database.py
index 19243571..2344178e 100644
--- a/spinn_utilities/make_tools/log_sqllite_database.py
+++ b/spinn_utilities/make_tools/log_sqllite_database.py
@@ -254,6 +254,7 @@ def set_log_info(
                         LIMIT 1
                         """, (log_level, line_num, original, file_id)):
                     return row["log_id"]
+        raise ValueError("unexpected no return")
 
     def get_log_info(self, log_id: str) -> Optional[Tuple[int, str, int, str]]:
         """
@@ -306,3 +307,4 @@ def get_max_log_id(self):
                     FROM log
                      """):
                 return row["max_id"]
+        raise ValueError("unexpected no return")