diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 79e24f5..6d18850 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -30,3 +30,4 @@
   script:
     - mkdir logs
     - korapxml2conllu rei.zip  | python ./systems/parse_spacy_pipe.py  | tee rei.spacy.conllu | conllu2korapxml > rei.spacy.zip
+    - ! grep -E '^0' ./rei.spacy.conllu