diff --git a/celery_progress/backend.py b/celery_progress/backend.py
index baba989..ee6f529 100644
--- a/celery_progress/backend.py
+++ b/celery_progress/backend.py
@@ -1,10 +1,12 @@
 import datetime
+import logging
 from abc import ABCMeta, abstractmethod
 from decimal import Decimal
 
 from celery.result import EagerResult, allow_join_result
 from celery.backends.base import DisabledBackend
 
+logger = logging.getLogger(__name__)
 
 PROGRESS_STATE = 'PROGRESS'
 
@@ -102,11 +104,12 @@ def get_info(self):
                 'progress': _get_unknown_progress(self.result.state),
             })
         else:
+            logger.error('Task %s has unknown state %s with metadata %s', self.result.id, self.result.state, self.result.info)
             response.update({
                 'complete': True,
                 'success': False,
                 'progress': _get_unknown_progress(self.result.state),
-                'result': 'Unknown state {}'.format(str(self.result.info)),
+                'result': 'Unknown state {}: {}'.format(self.result.state, str(self.result.info)),
             })
         return response