diff --git a/frontend/src/certs/Registers/index.tsx b/frontend/src/certs/Registers/index.tsx
index 7ffe5d3..34e4fa7 100644
--- a/frontend/src/certs/Registers/index.tsx
+++ b/frontend/src/certs/Registers/index.tsx
@@ -147,14 +147,18 @@ function RegisterEl(props: {register: Register, person: Person, onClick: () => v
 
         const generator = certGenerator[courseN];
         if (generator === undefined) {
-            console.error(`Generator function with key \`${courseN}\` not found`);
+            alert(`Generator function with key \`${courseN}\` not found`);
             return;
         }
 
         const {year, month, day} = dateComponents();
         const personFullName = `${person.person_names} ${person.person_paternal_surname} ${person.person_maternal_surname}`;
 
-        const certCustomLabel = customLabelsMap()[register.register_custom_label]?.custom_label_value ?? "";
+        // Manage custom label
+        const certCustomLabel = register.register_custom_label === 1
+            ? ""
+            : customLabelsMap()[register.register_custom_label]?.custom_label_value ?? "";
+
 
         generator(`${courseN} - ${personFullName}.docx`, {
             matpel: null,