diff --git a/l10n/de.json b/l10n/de.json
index 76f506e..1826aa5 100644
--- a/l10n/de.json
+++ b/l10n/de.json
@@ -29,7 +29,8 @@
         "Organizer contains invalid characters.": "Der Organisator enthält ungültige Zeichen.",
         "Invalid organizer email address.": "Ungültige E-Mail-Adresse des Organisators.",
         "No writable calendar was found in your account. Create one in the Nextcloud Calendar app, then try again.": "In deinem Konto wurde kein beschreibbarer Kalender gefunden. Erstelle einen in der Nextcloud-Kalender-App und versuche es erneut.",
-        "The selected calendar is no longer writable. Pick another one and try again.": "Der ausgewählte Kalender ist nicht mehr beschreibbar. Wähle einen anderen aus und versuche es erneut."
+        "The selected calendar is no longer writable. Pick another one and try again.": "Der ausgewählte Kalender ist nicht mehr beschreibbar. Wähle einen anderen aus und versuche es erneut.",
+        "The event could not be created. Please try again.": "Das Meeting konnte nicht erstellt werden. Bitte versuche es erneut."
     },
     "pluralForms": "nplurals=2; plural=(n != 1);"
 }
diff --git a/l10n/de_DE.json b/l10n/de_DE.json
index 3003f32..386dfca 100644
--- a/l10n/de_DE.json
+++ b/l10n/de_DE.json
@@ -29,7 +29,8 @@
         "Organizer contains invalid characters.": "Der Organisator enthält ungültige Zeichen.",
         "Invalid organizer email address.": "Ungültige E-Mail-Adresse des Organisators.",
         "No writable calendar was found in your account. Create one in the Nextcloud Calendar app, then try again.": "In Ihrem Konto wurde kein beschreibbarer Kalender gefunden. Erstellen Sie einen in der Nextcloud-Kalender-App und versuchen Sie es erneut.",
-        "The selected calendar is no longer writable. Pick another one and try again.": "Der ausgewählte Kalender ist nicht mehr beschreibbar. Wählen Sie einen anderen aus und versuchen Sie es erneut."
+        "The selected calendar is no longer writable. Pick another one and try again.": "Der ausgewählte Kalender ist nicht mehr beschreibbar. Wählen Sie einen anderen aus und versuchen Sie es erneut.",
+        "The event could not be created. Please try again.": "Das Meeting konnte nicht erstellt werden. Bitte versuchen Sie es erneut."
     },
     "pluralForms": "nplurals=2; plural=(n != 1);"
 }
diff --git a/l10n/en.json b/l10n/en.json
index 1defbc3..5de1e44 100644
--- a/l10n/en.json
+++ b/l10n/en.json
@@ -29,7 +29,8 @@
         "Organizer contains invalid characters.": "Organizer contains invalid characters.",
         "Invalid organizer email address.": "Invalid organizer email address.",
         "No writable calendar was found in your account. Create one in the Nextcloud Calendar app, then try again.": "No writable calendar was found in your account. Create one in the Nextcloud Calendar app, then try again.",
-        "The selected calendar is no longer writable. Pick another one and try again.": "The selected calendar is no longer writable. Pick another one and try again."
+        "The selected calendar is no longer writable. Pick another one and try again.": "The selected calendar is no longer writable. Pick another one and try again.",
+        "The event could not be created. Please try again.": "The event could not be created. Please try again."
     },
     "pluralForms": "nplurals=2; plural=(n != 1);"
 }
diff --git a/lib/Controller/CalendarController.php b/lib/Controller/CalendarController.php
index ac8b482..17087c2 100644
--- a/lib/Controller/CalendarController.php
+++ b/lib/Controller/CalendarController.php
@@ -20,6 +20,7 @@ use OCP\IURLGenerator;
 use OCP\IUserSession;
 use OCP\IDateTimeZone;
 use OCP\IL10N;
+use Psr\Log\LoggerInterface;
 use Sabre\VObject\Reader;
 
 class CalendarController extends Controller
@@ -67,6 +68,7 @@ class CalendarController extends Controller
     private IURLGenerator $urlGenerator;
     private IDateTimeZone $dateTimeZone;
     private IL10N $l10n;
+    private LoggerInterface $logger;
 
     public function __construct(
         string $appName,
@@ -76,7 +78,8 @@ class CalendarController extends Controller
         IUserSession $userSession,
         IURLGenerator $urlGenerator,
         IDateTimeZone $dateTimeZone,
-        IL10N $l10n
+        IL10N $l10n,
+        LoggerInterface $logger
     ) {
         parent::__construct($appName, $request);
 
@@ -86,6 +89,7 @@ class CalendarController extends Controller
         $this->urlGenerator = $urlGenerator;
         $this->dateTimeZone = $dateTimeZone;
         $this->l10n = $l10n;
+        $this->logger = $logger;
     }
 
     /**
@@ -202,7 +206,27 @@ class CalendarController extends Controller
             );
         }
 
-        $this->createEvent($calendar, $data);
+        /*
+         * Backend failures, e.g. CalendarException, must not end
+         * in a generic 500 page. Log the cause, re-render the form.
+         */
+        try {
+            $this->createEvent($calendar, $data);
+        } catch (\Throwable $e) {
+            $this->logger->error(
+                'Failed to create calendar event: ' . $e->getMessage(),
+                ['exception' => $e]
+            );
+
+            return $this->renderConfirm(
+                $data,
+                $calendars,
+                $calendarId,
+                $this->l10n->t(
+                    'The event could not be created. Please try again.'
+                )
+            );
+        }
 
         /*
          * Open the Nextcloud Calendar application if enabled,