diff --git a/components/AppNotifications.tsx b/components/AppNotifications.tsx
index 2c39cef..477c715 100644
--- a/components/AppNotifications.tsx
+++ b/components/AppNotifications.tsx
@@ -47,7 +47,7 @@ export default function AppNotifications(props: AppNotificationsProps) {
     }, [props.notifications, showMoreClicked]);
 
     const hasNewNotifications = useMemo(() => {
-        if (lastSeenNotification === -1) return true; // if no notification was seen
+        if (lastSeenNotification === -1) return props.notifications.length > 0;
         return props.notifications.some(notification => notification.id > lastSeenNotification);
     }, [lastSeenNotification, props.notifications]);
 
diff --git a/components/inbox-mail/CreateNewMailModal.tsx b/components/inbox-mail/CreateNewMailModal.tsx
index 66d07fa..9e1fd02 100644
--- a/components/inbox-mail/CreateNewMailModal.tsx
+++ b/components/inbox-mail/CreateNewMailModal.tsx
@@ -275,9 +275,9 @@ function UserSelector(props: UserSelectorProps) {
             setFilteredUsers(
                 props.users.filter(
                     (u) =>
-                        u.firstName.toLowerCase().includes(lower) ||
-                        u.lastName.toLowerCase().includes(lower) ||
-                        u.mail.toLowerCase().includes(lower)
+                        (u.firstName && u.firstName.toLowerCase().includes(lower)) ||
+                        (u.lastName && u.lastName.toLowerCase().includes(lower)) ||
+                        (u.mail && u.mail.toLowerCase().includes(lower))
                 ).filter((u) => !props.selectedUsers.some((selected) => selected.id === u.id))
             );
         }
diff --git a/components/inbox-mail/InboxMailAdminPanel.tsx b/components/inbox-mail/InboxMailAdminPanel.tsx
index 8425cac..22ca005 100644
--- a/components/inbox-mail/InboxMailAdminPanel.tsx
+++ b/components/inbox-mail/InboxMailAdminPanel.tsx
@@ -68,8 +68,8 @@ function InboxMailAdminPanel(props: InboxMailAdminPanelProps) {
                 {props.selectedThread.progressState !== InboxMailThreadSupportProgressState.PENDING && props.selectedThread.metaData?.supportOwnerName && (
                     <div className="bg-orange-400 text-white rounded-full px-2 py-0.5 text-xs flex items-center gap-x-2 ml-2">
                         <IconProgressCheck className="w-5 h-5" />
-                        {props.selectedThread.metaData.supportOwnerName.first}{" "}
-                        {props.selectedThread.metaData.supportOwnerName.last}
+                        {props.selectedThread.metaData.supportOwnerName?.first}{" "}
+                        {props.selectedThread.metaData.supportOwnerName?.last}
                     </div>
                 )}
             </div>
diff --git a/components/inbox-mail/InboxMailItem.tsx b/components/inbox-mail/InboxMailItem.tsx
index 0da1e04..9e2f1f6 100644
--- a/components/inbox-mail/InboxMailItem.tsx
+++ b/components/inbox-mail/InboxMailItem.tsx
@@ -38,7 +38,7 @@ export default function ThreadMailItem(props: ThreadMailItemProps) {
                         </div>
 
                         <span className="text-sm text-gray-500">
-                            {t("inboxMail.to")}: {props.mail.recipientNames.map((name) => `${name.first} ${name.last}`).join(", ")}
+                            {t("inboxMail.to")}: {props.mail.recipientNames.map((name) => `${name?.first} ${name?.last}`).join(", ")}
                         </span>
                     </div>
                 </div>
diff --git a/components/inbox-mail/helper.ts b/components/inbox-mail/helper.ts
index 778fe7f..05bc625 100644
--- a/components/inbox-mail/helper.ts
+++ b/components/inbox-mail/helper.ts
@@ -5,7 +5,11 @@ import { getNewInboxMailsInfo } from "./service-mail";
 
 export const MAIL_LIMIT_PER_PAGE = 8;
 
-const setInitials = (first: string, last: string) => first[0]?.toUpperCase() + last[0]?.toUpperCase();
+const setInitials = (first?: string, last?: string) => {
+    const firstInitial = first && first.length > 0 ? first[0].toUpperCase() : "";
+    const lastInitial = last && last.length > 0 ? last[0].toUpperCase() : "";
+    return firstInitial + lastInitial;
+};
 
 export function prepareThreadDisplayData(
     thread: InboxMailThread,
@@ -44,52 +48,52 @@ export function prepareThreadDisplayData(
     }
     else if (!thread.isAdminSupportThread) {
         if (thread.latestMail.senderId === currentUser.id) {
-            displayName = thread.latestMail.recipientNames.map(r => `${r.first} ${r.last}`).join(", ");
+            displayName = thread.latestMail.recipientNames.map(r => `${r?.first} ${r?.last}`).join(", ");
             const r = thread.latestMail.recipientNames[0];
-            displayInitials = setInitials(r.first, r.last);
+            displayInitials = setInitials(r?.first, r?.last);
             setColor(recipientIds[0]);
         } else {
             const s = thread.latestMail.senderName;
-            const first = s.first ?? "";
-            const last = s.last ?? "";
+            const first = s?.first ?? "";
+            const last = s?.last ?? "";
             displayName = `${first} ${last}`.trim();
             displayInitials = setInitials(first, last);
             setColor(thread.latestMail.senderId);
         }
     } else if (thread.isAdminSupportThread && thread.metaData?.autoGenerated) {
         if (thread.latestMail.senderId) {
-            displayName = thread.latestMail.recipientNames.map(r => `${r.first} ${r.last}`).join(", ");
+            displayName = thread.latestMail.recipientNames.map(r => `${r?.first} ${r?.last}`).join(", ");
         }
         else {
-            displayName = `${thread.latestMail.senderName.first} ${thread.latestMail.senderName.last}`;
+            displayName = `${thread.latestMail.senderName?.first} ${thread.latestMail.senderName?.last}`;
             DisplayIcon = IconBug
             background = "#FFE5E5";
             text = "#A30000";
         }
     } else if (thread.isAdminSupportThread && isAdmin && thread.latestMail.senderId === currentUser.id) {
-        displayName = `${thread.latestMail.senderName.first} ${thread.latestMail.senderName.last}`;
-        displayInitials = setInitials(thread.latestMail.senderName.first, thread.latestMail.senderName.last);
+        displayName = `${thread.latestMail.senderName?.first} ${thread.latestMail.senderName?.last}`;
+        displayInitials = setInitials(thread.latestMail.senderName?.first, thread.latestMail.senderName?.last);
         setColor(thread.latestMail.senderId);
 
     } else if (thread.isAdminSupportThread && isAdmin) {
         if (thread.latestMail.senderId === currentUser.id && thread.latestMail.recipientNames.length === 0) {
-            displayName = `${thread.latestMail.senderName.first} ${thread.latestMail.senderName.last}`;
+            displayName = `${thread.latestMail.senderName?.first} ${thread.latestMail.senderName?.last}`;
         } else if (thread.latestMail.senderId === currentUser.id) {
-            displayName = thread.latestMail.recipientNames.map(r => `${r.first} ${r.last}`).join(", ");
+            displayName = thread.latestMail.recipientNames.map(r => `${r?.first} ${r?.last}`).join(", ");
             const r = thread.latestMail.recipientNames[0];
-            displayInitials = setInitials(r.first, r.last);
+            displayInitials = setInitials(r?.first, r?.last);
             setColor(recipientIds[0]);
         } else {
             const s = thread.latestMail.senderName;
-            displayName = `${s.first} ${s.last}`;
-            displayInitials = setInitials(s.first ?? "", s.last ?? "");
+            displayName = `${s?.first} ${s?.last}`;
+            displayInitials = setInitials(s?.first ?? "", s?.last ?? "");
             setColor(thread.latestMail.senderId ?? thread.createdBy);
         }
     } else {
         if (thread.latestMail.senderId === currentUser.id) {
-            displayName = thread.latestMail.recipientNames.map(r => `${r.first} ${r.last}`).join(", ");
+            displayName = thread.latestMail.recipientNames.map(r => `${r?.first} ${r?.last}`).join(", ");
         } else {
-            displayName = `${thread.latestMail.senderName.first} ${thread.latestMail.senderName.last}`;
+            displayName = `${thread.latestMail.senderName?.first} ${thread.latestMail.senderName?.last}`;
         }
     }