diff --git a/htdocs/adherents/document.php b/htdocs/adherents/document.php
index 6cc0ddd0c4f..59328f24fd5 100644
--- a/htdocs/adherents/document.php
+++ b/htdocs/adherents/document.php
@@ -52,7 +52,7 @@ $result=restrictedArea($user,'adherent',$id);
 $sortfield = GETPOST("sortfield",'alpha');
 $sortorder = GETPOST("sortorder",'alpha');
 $page = GETPOST("page",'int');
-if ($page == -1 || $page == null) { $page = 0 ; }
+if (empty($page) || $page == -1) { $page = 0; }     // If $page is not defined, or '' or -1
 $offset = $conf->liste_limit * $page ;
 $pageprev = $page - 1;
 $pagenext = $page + 1;
diff --git a/htdocs/adherents/subscription/list.php b/htdocs/adherents/subscription/list.php
index 6b4bcaa74ae..398039b228e 100644
--- a/htdocs/adherents/subscription/list.php
+++ b/htdocs/adherents/subscription/list.php
@@ -46,7 +46,7 @@ $limit = GETPOST('limit','int')?GETPOST('limit','int'):$conf->liste_limit;
 $sortfield = GETPOST("sortfield",'alpha');
 $sortorder = GETPOST("sortorder",'alpha');
 $page = GETPOST("page",'int');
-if ($page == -1 || $page == null) { $page = 0 ; }
+if (empty($page) || $page == -1) { $page = 0; }     // If $page is not defined, or '' or -1
 $offset = $limit * $page ;
 $pageprev = $page - 1;
 $pagenext = $page + 1;
diff --git a/htdocs/admin/dict.php b/htdocs/admin/dict.php
index 068513b245c..fb9a101d474 100644
--- a/htdocs/admin/dict.php
+++ b/htdocs/admin/dict.php
@@ -74,7 +74,7 @@ $active = 1;
 $sortfield = GETPOST("sortfield",'alpha');
 $sortorder = GETPOST("sortorder",'alpha');
 $page = GETPOST("page",'int');
-if ($page == -1 || $page == null) { $page = 0 ; }
+if (empty($page) || $page == -1) { $page = 0; }     // If $page is not defined, or '' or -1
 $offset = $listlimit * $page ;
 $pageprev = $page - 1;
 $pagenext = $page + 1;
diff --git a/htdocs/admin/mails_templates.php b/htdocs/admin/mails_templates.php
index 4e25e93084b..8c1cb138bc3 100644
--- a/htdocs/admin/mails_templates.php
+++ b/htdocs/admin/mails_templates.php
@@ -70,7 +70,7 @@ $active = 1;
 $sortfield = GETPOST("sortfield",'alpha');
 $sortorder = GETPOST("sortorder",'alpha');
 $page = GETPOST("page",'int');
-if ($page == -1 || $page == null) { $page = 0 ; }
+if (empty($page) || $page == -1) { $page = 0; }     // If $page is not defined, or '' or -1
 $offset = $listlimit * $page ;
 $pageprev = $page - 1;
 $pagenext = $page + 1;
diff --git a/htdocs/admin/tools/listsessions.php b/htdocs/admin/tools/listsessions.php
index 6106fbe8dd8..76f7debf3e7 100644
--- a/htdocs/admin/tools/listsessions.php
+++ b/htdocs/admin/tools/listsessions.php
@@ -47,7 +47,7 @@ $langs->load("other");
 $sortfield = GETPOST("sortfield",'alpha');
 $sortorder = GETPOST("sortorder",'alpha');
 $page = GETPOST("page",'int');
-if ($page == -1 || $page == null) { $page = 0 ; }
+if (empty($page) || $page == -1) { $page = 0; }     // If $page is not defined, or '' or -1
 $offset = $conf->liste_limit * $page ;
 $pageprev = $page - 1;
 $pagenext = $page + 1;