diff --git a/.changeset/eighty-ligers-punch.md b/.changeset/eighty-ligers-punch.md
new file mode 100644
index 000000000000..ee7acbec3b87
--- /dev/null
+++ b/.changeset/eighty-ligers-punch.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/svelte': patch
+---
+
+Fixes an Reference Error that occurred during client transitions
diff --git a/packages/integrations/svelte/client-v5.js b/packages/integrations/svelte/client-v5.js
index 78bab3ea34b3..7a046b5bfd08 100644
--- a/packages/integrations/svelte/client-v5.js
+++ b/packages/integrations/svelte/client-v5.js
@@ -39,8 +39,7 @@ export default (element) => {
 				},
 			});
 			existingApplications.set(element, component);
+			element.addEventListener('astro:unmount', () => unmount(component), { once: true });
 		}
-
-		element.addEventListener('astro:unmount', () => unmount(component), { once: true });
 	};
 };