1. diff --git a/jenkins_jobs/parser.py b/jenkins_jobs/parser.py
  2. index 4d5cf24..d2684fa 100644
  3. --- a/jenkins_jobs/parser.py
  4. +++ b/jenkins_jobs/parser.py
  5. @@ -296,14 +296,21 @@ class YamlParser(object):
  6. params = copy.deepcopy(project)
  7. params = self.applyDefaults(params, template)
  9. - expanded_values = {}
  10. - for (k, v) in values:
  11. - if isinstance(v, dict):
  12. - inner_key = next(iter(v))
  13. - expanded_values[k] = inner_key
  14. - expanded_values.update(v[inner_key])
  15. - else:
  16. - expanded_values[k] = v
  17. + try:
  18. + expanded_values = {}
  19. + for (k, v) in values:
  20. + if isinstance(v, dict):
  21. + inner_key = next(iter(v))
  22. + expanded_values[k] = inner_key
  23. + expanded_values.update(v[inner_key])
  24. + else:
  25. + expanded_values[k] = v
  26. + except Exception:
  27. + logger.error(
  28. + "Exception thrown while expanding template '%s' for "
  29. + "project '%s', with expansion arguments of:\n%s",
  30. + template_name, project['name'], values)
  31. + raise

Provide error output debug when exception occurs.