diff --git a/qurator/dinglehopper/templates/report.json.j2 b/qurator/dinglehopper/templates/report.json.j2
index 62a242d..0e8af03 100644
--- a/qurator/dinglehopper/templates/report.json.j2
+++ b/qurator/dinglehopper/templates/report.json.j2
@@ -1,8 +1,10 @@
 {
     "gt": "{{ gt }}",
     "ocr": "{{ ocr }}",
+{% if metrics %}
     "cer": {{ cer|json_float }},
     "wer": {{ wer|json_float }},
+{% endif %}
     "n_characters": {{ n_characters }},
     "n_words": {{ n_words }}
 }