diff --git a/frontend/src/lib/components/DateRangeCollapse.svelte b/frontend/src/lib/components/DateRangeCollapse.svelte
index 373c01f..7ff595f 100644
--- a/frontend/src/lib/components/DateRangeCollapse.svelte
+++ b/frontend/src/lib/components/DateRangeCollapse.svelte
@@ -410,7 +410,9 @@
 							<p class="text-sm text-base-content font-medium">
 								{#if isAllDay(visit.start_date)}
 									<span class="badge badge-outline mr-2">{$t('adventures.all_day')}</span>
-									{visit.start_date ? visit.start_date.split('T')[0] : ''} – {visit.end_date
+									{visit.start_date && typeof visit.start_date === 'string'
+										? visit.start_date.split('T')[0]
+										: ''} – {visit.end_date && typeof visit.end_date === 'string'
 										? visit.end_date.split('T')[0]
 										: ''}
 								{:else if 'start_timezone' in visit}
diff --git a/frontend/src/routes/adventures/[id]/+page.svelte b/frontend/src/routes/adventures/[id]/+page.svelte
index 9594ff6..b055d43 100644
--- a/frontend/src/routes/adventures/[id]/+page.svelte
+++ b/frontend/src/routes/adventures/[id]/+page.svelte
@@ -365,7 +365,9 @@
 														<div class="flex items-center gap-2 mb-2">
 															<span class="badge badge-primary">All Day</span>
 															<span class="font-semibold">
-																{visit.start_date.split('T')[0]} – {visit.end_date.split('T')[0]}
+																{visit.start_date ? visit.start_date.split('T')[0] : ''} – {visit.end_date
+																	? visit.end_date.split('T')[0]
+																	: ''}
 															</span>
 														</div>
 													{:else}