Fix conditional

services/web/app/views/subscriptions/plans.pug

@@ -76,7 +76,7 @@ block content
 													br
 													a.btn.btn-info(
 														href="/register"
-														style=(getLoggedInUserId() === undefined ? "" : "visibility: hidden")
+														style=(getLoggedInUserId() === null ? "" : "visibility: hidden")
 													) #{translate("sign_up_now")}
 									.col-md-4
 										.card.card-highlighted
@@ -142,7 +142,7 @@ block content
 													br
 													a.btn.btn-info(
 														href="/register"
-														style=(getLoggedInUserId() === undefined ? "" : "visibility: hidden")
+														style=(getLoggedInUserId() === null ? "" : "visibility: hidden")
 													) #{translate("sign_up_now")}
 
 									.col-md-4