From cc18f3f23ce5568ce66834a1de3ea3abfe5c927b Mon Sep 17 00:00:00 2001
From: Ines Montani <ines@ines.io>
Date: Thu, 28 Jan 2021 13:11:20 +1100
Subject: [PATCH] Improve Example error handling for NER data (#6835)

* Improve Example error handling for NER data

* Fix conditional
---
 spacy/training/example.pyx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/spacy/training/example.pyx b/spacy/training/example.pyx
index bbe59e9f4..dc1c74e8a 100644
--- a/spacy/training/example.pyx
+++ b/spacy/training/example.pyx
@@ -356,7 +356,9 @@ def _add_entities_to_doc(doc, ner_data):
         return
     elif ner_data == []:
         doc.ents = []
-    elif isinstance(ner_data[0], tuple):
+    elif not isinstance(ner_data, (list, tuple)):
+        raise ValueError(Errors.E973)
+    elif isinstance(ner_data[0], (list, tuple)):
         return _add_entities_to_doc(
             doc,
             offsets_to_biluo_tags(doc, ner_data)