diff --git a/ui/src/components/StudentGrades.svelte b/ui/src/components/StudentGrades.svelte
index d9668b1..cb549ba 100644
--- a/ui/src/components/StudentGrades.svelte
+++ b/ui/src/components/StudentGrades.svelte
@@ -63,7 +63,7 @@
                                 <td><a href="users/{user.login}" style="text-decoration: none">{user.login}</a></td>
                                 {#each surveys as survey (survey.id)}
                                     {#if survey.corrected && (promo === null || survey.promo == promo)}
-                                        <td>{grades[user.id][survey.id]?grades[user.id][survey.id]:"N/A"}</td>
+                                        <td>{grades[user.id] && grades[user.id][survey.id]?grades[user.id][survey.id]:"N/A"}</td>
                                     {/if}
                                 {/each}
                             </tr>