diff --git a/app/views/assiduites.py b/app/views/assiduites.py
index 628b49b8..eb5896bc 100644
--- a/app/views/assiduites.py
+++ b/app/views/assiduites.py
@@ -934,6 +934,7 @@ def _get_etuds_dem_def(formsemestre):
     for etud in etuds_dem_def:
         json_str += template.replace("£", str(etud[0])).replace("$", etud[1])
 
-    json_str = json_str[:-1] + "}"
+    if json_str != "{":
+        json_str = json_str[:-1] + "}"
 
     return json_str