fix: check input is not undefined (#5927)

Signed-off-by: Udit Takkar <udit.07814802719@cse.mait.ac.in>

Signed-off-by: Udit Takkar <udit.07814802719@cse.mait.ac.in>
Co-authored-by: sean-brydon <55134778+sean-brydon@users.noreply.github.com>
Co-authored-by: Peer Richelsen <peeroke@gmail.com>

apps/web/pages/event-types/[type]/index.tsx

@@ -283,7 +283,7 @@ const EventTypePage = (props: inferSSRProps<typeof getServerSideProps>) => {
             if (metadata?.multipleDuration.length < 1) {
               throw new Error(t("event_setup_multiple_duration_error"));
             } else {
-              if (!metadata?.multipleDuration?.includes(input.length)) {
+              if (input.length && !metadata?.multipleDuration?.includes(input.length)) {
                 throw new Error(t("event_setup_multiple_duration_default_error"));
               }
             }