diff --git a/web/template/admin/admin_tabs/course-import.gohtml b/web/template/admin/admin_tabs/course-import.gohtml
index ea3e189e9..b204b309c 100644
--- a/web/template/admin/admin_tabs/course-import.gohtml
+++ b/web/template/admin/admin_tabs/course-import.gohtml
@@ -76,21 +76,21 @@
                         </label>
                         <table>
                             <tbody>
-                                <template x-for="contact in course.contacts">
-                                    <tr class="pl-3" :class="contact.main_contact?'text-green-400':'text-3'">
-                                        <td class="px-2">
-                                            <label>
-                                                <i class="fa fa-envelope" x-show="contact.main_contact"></i>
-                                                <input class="w-auto" type="checkbox" x-model="contact.main_contact">
-                                            </label>
-                                        </td>
-                                        <td class="px-2" x-text="contact.role + ':'"></td>
-                                        <td x-text="contact.first_name + ' ' + contact.last_name" class="px-2"></td>
-                                        <td class="px-2">
-                                            <a :href="'mailto:'+contact.email" x-text="contact.email"></a>
-                                        </td>
-                                    </tr>
-                                </template>
+                            <template x-for="contact in admin.filterUniqueContacts(course.contacts)">
+                                <tr class="pl-3" :class="contact.main_contact ? 'text-green-400' : 'text-3'">
+                                    <td class="px-2">
+                                        <label>
+                                            <i class="fa fa-envelope" x-show="contact.main_contact"></i>
+                                            <input class="w-auto" type="checkbox" x-model="contact.main_contact">
+                                        </label>
+                                    </td>
+                                    <td class="px-2" x-text="contact.role + ':'"></td>
+                                    <td x-text="contact.first_name + ' ' + contact.last_name" class="px-2"></td>
+                                    <td class="px-2">
+                                        <a :href="'mailto:' + contact.email" x-text="contact.email"></a>
+                                    </td>
+                                </tr>
+                            </template>
                             </tbody>
                         </table>
                         <template x-for="event in course.events">
diff --git a/web/ts/course-import.ts b/web/ts/course-import.ts
index 19477089d..170f35f8b 100644
--- a/web/ts/course-import.ts
+++ b/web/ts/course-import.ts
@@ -44,3 +44,17 @@ export function addNotifyEventListeners() {
         window.location.replace("/");
     });
 }
+
+//The data coming from TUMonline sometimes duplicates contacts of some courses. course.contacts has 5 attributes:
+//first_name, last_name, email, main_contact, role.
+//All cases considered, the most distinctive among them is e-mail and duplicates are eliminated accordingly.
+export function filterUniqueContacts(contacts) {
+    const uniqueEmails = new Set();
+    return contacts.filter((contact) => {
+        if (!uniqueEmails.has(contact.email)) {
+            uniqueEmails.add(contact.email);
+            return true;
+        }
+        return false;
+    });
+}