diff --git a/backend/repository/tribe_sqlite_repository.py b/backend/repository/tribe_sqlite_repository.py
index cc2a4e9..1b9c2fd 100644
--- a/backend/repository/tribe_sqlite_repository.py
+++ b/backend/repository/tribe_sqlite_repository.py
@@ -28,6 +28,13 @@ class TribeSQLiteRepository(AbstractRepository):
         )
 
     def update(self, name: str, tribe: Tribe) -> None:
+        tribes = self.list()
+
+        if name not in map(lambda x: x.name, tribes):
+            raise TribeRepositoryError(
+                f"The tribe {name} doesn't exists. Can't update it"
+            )
+
         self.conn.execute(
             """
             UPDATE tribes SET name=:newname, level=:newlevel WHERE name=:name
@@ -66,6 +73,12 @@ class TribeSQLiteRepository(AbstractRepository):
         return [Tribe(*r) for r in rows]
 
     def delete(self, tribe: Tribe) -> None:
+        tribes = self.list()
+        if tribe.name not in map(lambda x: x.name, tribes):
+            raise TribeRepositoryError(
+                f"The tribe {tribe.name} doesn't exists. Can't delete it."
+            )
+
         self.conn.execute(
             """
             DELETE FROM tribes WHERE name=:name
diff --git a/tests/integration/test_repository_tribe_sqlite.py b/tests/integration/test_repository_tribe_sqlite.py
index 6e8f709..2b4f80c 100644
--- a/tests/integration/test_repository_tribe_sqlite.py
+++ b/tests/integration/test_repository_tribe_sqlite.py
@@ -96,12 +96,22 @@ def test_update_tribe(sqlite_conn):
     assert tribe_repo.list() == prebuild_tribes
 
 
+def test_update_tribe_not_exists(sqlite_conn):
+    prebuild_tribes = populate_tribes(sqlite_conn)
+
+    tribe_repo = TribeSQLiteRepository(sqlite_conn)
+
+    name = prebuild_tribes[0].name
+    new_tribe = Tribe("Tribe0", "Term")
+    with pytest.raises(TribeRepositoryError):
+        tribe_repo.update("iouiou", new_tribe)
+
+
 def test_delete_tribe(sqlite_conn):
     prebuild_tribes = populate_tribes(sqlite_conn)
 
     tribe_repo = TribeSQLiteRepository(sqlite_conn)
     deleted_tribe = prebuild_tribes.pop()
-    tribe_repo.delete(deleted_tribe)
-    sqlite_conn.commit()
-
-    assert tribe_repo.list() == prebuild_tribes
+    deleted_tribe.name = "iouiou"
+    with pytest.raises(TribeRepositoryError):
+        tribe_repo.delete(deleted_tribe)