diff --git a/scripts/generate_pack.py b/scripts/generate_pack.py
index bceb436b..2c379045 100644
--- a/scripts/generate_pack.py
+++ b/scripts/generate_pack.py
@@ -2337,6 +2337,8 @@ def _run_platform_packs(
             else:
                 print(f"\nGenerating pack for {representative} {_pack_label(source, required_only)}...")
 
+            zip_path = None
+            zip_paths: list = []
             try:
                 tc = target_cores_cache.get(representative) if args.target else None
                 if args.split:
diff --git a/tests/test_system_selection.py b/tests/test_system_selection.py
index 916730de..14a09a9b 100644
--- a/tests/test_system_selection.py
+++ b/tests/test_system_selection.py
@@ -85,6 +85,7 @@ class ADeclinedBuildIsAFailure(unittest.TestCase):
                 capture_output=True, text=True, cwd=str(REPO_ROOT), timeout=600, check=False,
             )
             self.assertNotEqual(proc.returncode, 0, proc.stdout + proc.stderr)
+            self.assertNotIn("Traceback", proc.stderr, proc.stderr)
             self.assertEqual([p for p in os.listdir(tmp) if p.endswith(".zip")], [])