diff --git a/yeswiki-move.php b/yeswiki-move.php
index c0ee600..6acd69c 100755
--- a/yeswiki-move.php
+++ b/yeswiki-move.php
@@ -60,7 +60,7 @@ if (!domainIsOnServer($fromDomainWithoutWww)) {
     $climate->error('ERROR : Domain '.$fromUrl['host'].' was not found on the server.'."\n");
     exit;
 }
-if (!wikiIsOnServer($fromDomainWithoutWww.$fromUrl['path'])) {
+if (!wikiIsOnServer($fromDomainWithoutWww.($fromUrl['path'] ?? ''))) {
     $climate->error('ERROR : no Yeswiki found '.$fromDomainWithoutWww.$fromUrl['path'].' on the server.'."\n");
     exit;
 }
@@ -76,7 +76,7 @@ if (!domainIsOnServer($toDomainWithoutWww)) {
     $climate->error('ERROR : Domain '.$toUrl['host'].' was not found on the server.'."\n");
     exit;
 }
-if (!wikiIsOnServer($toDomainWithoutWww.$toUrl['path'])) {
+if (!wikiIsOnServer($toDomainWithoutWww.($toUrl['path'] ?? ''))) {
     $climate->error('ERROR : no Yeswiki found '.$toDomainWithoutWww.$toUrl['path'].' on the server.'."\n");
     exit;
 }