diff --git a/corrlib/toml.py b/corrlib/toml.py
index 07de93d..def5394 100644
--- a/corrlib/toml.py
+++ b/corrlib/toml.py
@@ -95,11 +95,9 @@ def import_toml(path: str, file: str, copy_file: bool=True) -> None:
     project: dict = toml_dict['project']
     if project['code'] not in known_codes:
         raise ValueError('Code' + project['code'] + 'has no import implementation!')
-    constants: dict = toml_dict['constants']
     measurements: dict = toml_dict['measurements']
-    measurements = fill_cons(measurements, constants)
+    measurements = fill_cons(measurements, toml_dict['constants'] if 'constants' in toml_dict else {})
     measurements = replace_in_meas(measurements, toml_dict['replace'] if 'replace' in toml_dict else {})
-    print(measurements)
     check_measurement_data(measurements, project['code'])
     aliases = project.get('aliases', None)
     uuid = project.get('uuid', None)