diff --git a/mailpoet/assets/js/src/newsletters/send.tsx b/mailpoet/assets/js/src/newsletters/send.tsx
index d16acfd50e..519c981c10 100644
--- a/mailpoet/assets/js/src/newsletters/send.tsx
+++ b/mailpoet/assets/js/src/newsletters/send.tsx
@@ -874,7 +874,7 @@ class NewsletterSendComponent extends Component<
                     MailPoet.FeaturesController.isSupported(
                       'gutenberg_email_editor',
                     ) && wpPostId
-                      ? MailPoet.getBlockEmailEditorUrl(wpPostId)
+                      ? MailPoet.getBlockEmailEditorUrl(Number(wpPostId))
                       : `?page=mailpoet-newsletter-editor&id=${Number(
                           this.props.params.id,
                         )}`