diff --git a/tasks/02-bibliotheca-main.sh b/tasks/02-bibliotheca-main.sh
index ca7b4c8..c2a9a7e 100755
--- a/tasks/02-bibliotheca-main.sh
+++ b/tasks/02-bibliotheca-main.sh
@@ -625,7 +625,7 @@ if curl -fs \
         "mode": "row-based"
       },
       "baseColumnName": "M|ART",
-      "expression": $(echo "grel:${expression}" | ${jq} -s -R '.')
+      "expression": $(echo "grel:${expression}" | ${jq} -s -R '.'),
       "onError": "set-to-blank",
       "newColumnName": "0500",
       "columnInsertIndex": 3