diff --git a/nifi/user-scripts/parse-anns-from-nlp-response-bulk.py b/nifi/user-scripts/parse-anns-from-nlp-response-bulk.py
index 5859bb53..492dffc3 100644
--- a/nifi/user-scripts/parse-anns-from-nlp-response-bulk.py
+++ b/nifi/user-scripts/parse-anns-from-nlp-response-bulk.py
@@ -71,7 +71,7 @@ def process(self, inputStream, outputStream):
             
             # sometimes there's an empty annotation list
             if len(annotations.keys()) == 0:
-                log.info("Empty annotation list - " + footer[DOCUMENT_ID_FIELD_NAME])
+                log.info("Empty annotation list - " + str(footer[DOCUMENT_ID_FIELD_NAME]))
                 continue
             
             anns_ids=[]