diff --git a/apps/builder/src/features/editor/providers/TypebotProvider/TypebotProvider.tsx b/apps/builder/src/features/editor/providers/TypebotProvider/TypebotProvider.tsx
index 055af6368..e03cad0cd 100644
--- a/apps/builder/src/features/editor/providers/TypebotProvider/TypebotProvider.tsx
+++ b/apps/builder/src/features/editor/providers/TypebotProvider/TypebotProvider.tsx
@@ -52,7 +52,7 @@ type UpdateTypebotPayload = Partial<{
   publicId: string
   name: string
   icon: string
-  customDomain: string
+  customDomain: string | null
   resultsTablePreferences: ResultsTablePreferences
   isClosed: boolean
 }>
diff --git a/apps/builder/src/features/publish/components/SharePage.tsx b/apps/builder/src/features/publish/components/SharePage.tsx
index b3b285e2e..dab31bf6d 100644
--- a/apps/builder/src/features/publish/components/SharePage.tsx
+++ b/apps/builder/src/features/publish/components/SharePage.tsx
@@ -49,7 +49,7 @@ export const SharePage = () => {
     handleCustomDomainChange(newDomain)
   }
 
-  const handleCustomDomainChange = (customDomain: string | undefined) =>
+  const handleCustomDomainChange = (customDomain: string | null) =>
     updateTypebot({ customDomain })
 
   const checkIfPathnameIsValid = (pathname: string) => {
@@ -116,7 +116,7 @@ export const SharePage = () => {
                   icon={<TrashIcon />}
                   aria-label="Remove custom domain"
                   size="xs"
-                  onClick={() => handleCustomDomainChange(undefined)}
+                  onClick={() => handleCustomDomainChange(null)}
                 />
               </HStack>
             )}