diff --git a/VERSIONS_HOTLINE/163882 b/VERSIONS_HOTLINE/163882
new file mode 100644
index 0000000000000000000000000000000000000000..db2431b39c8cc4baf59748a8c204668154dc5ef4
--- /dev/null
+++ b/VERSIONS_HOTLINE/163882
@@ -0,0 +1 @@
+  - ticket#163882 : [MT] Recherche : Quand certains utilisateurs avec un nombre de notices par pages non numérique, page blanche.
\ No newline at end of file
diff --git a/library/Class/CriteresRecherche.php b/library/Class/CriteresRecherche.php
index 7db0d071bac059a5c22cdb542247bdb464db4ff6..d8b5dc30b78a39886d2c91ac95b143392e6ff94c 100644
--- a/library/Class/CriteresRecherche.php
+++ b/library/Class/CriteresRecherche.php
@@ -1008,8 +1008,8 @@ class Class_CriteresRecherche extends Class_CriteresRecherche_Abstract {
   }
 
 
-  public function getPageSize() {
-    if ($size = $this->getParam('page_size'))
+  public function getPageSize() : int {
+    if ($size = (int) $this->getParam('page_size'))
       return $size;
 
     if ($user_page_size = (new Class_User_Settings(Class_Users::getIdentity()))->getSearchPageSize())
diff --git a/library/Class/CriteresRecherche/Abstract.php b/library/Class/CriteresRecherche/Abstract.php
index 3f1288a066c65677e5baea192910b9775e872be2..2afa02fad302b67043686c95281993ebd3446880 100644
--- a/library/Class/CriteresRecherche/Abstract.php
+++ b/library/Class/CriteresRecherche/Abstract.php
@@ -163,8 +163,8 @@ abstract class Class_CriteresRecherche_Abstract {
   }
 
 
-  public function getPageSize() {
-    return $this->getParam('page_size',
+  public function getPageSize() : int {
+    return (int) $this->getParam('page_size',
                            $this->_default_page_size);
   }
 
diff --git a/library/Class/MoteurRecherche/Result.php b/library/Class/MoteurRecherche/Result.php
index af4912deb2fbbbe702b696871e6f7cf350d5e08a..1776d975ab99b7e1cceaa0020840b057242e9577 100644
--- a/library/Class/MoteurRecherche/Result.php
+++ b/library/Class/MoteurRecherche/Result.php
@@ -238,7 +238,7 @@ class Class_MoteurRecherche_Result {
   }
 
 
-  public function getRecordsCount() {
+  public function getRecordsCount() : int {
     return count($this->fetchAllRecordsIds());
   }
 
@@ -315,7 +315,7 @@ class Class_MoteurRecherche_ResultWork extends Class_MoteurRecherche_Result {
   }
 
 
-  public function getRecordsCount() {
+  public function getRecordsCount() : int {
     $this->fetchAllRecordsIds();
     return count($this->_works);
   }
diff --git a/library/Class/User/Settings.php b/library/Class/User/Settings.php
index 41d351e73f84f41c58863e7dab42236e1c9ca9e7..df17ad20d6988a76aae40bb9d3ec52c25e096122 100644
--- a/library/Class/User/Settings.php
+++ b/library/Class/User/Settings.php
@@ -288,7 +288,7 @@ class Class_User_Settings {
 
 
   protected function _saveUserWithLib($id) : self {
-    if ($id === $this->get(Class_User_Setting::BOOKMARKED_LIBRARIES))
+    if ((int) $id === (int) $this->get(Class_User_Setting::BOOKMARKED_LIBRARIES))
       return $this;
 
     $this->set(Class_User_Setting::BOOKMARKED_LIBRARIES, [$id]);
@@ -364,12 +364,12 @@ class Class_User_Settings {
   }
 
 
-  public function getSearchPageSize() {
-    return $this->get(Class_User_Setting::SEARCH_PAGE_SIZE);
+  public function getSearchPageSize() : int {
+    return (int) $this->get(Class_User_Setting::SEARCH_PAGE_SIZE);
   }
 
 
-  public function setSearchPageSize($size) {
+  public function setSearchPageSize(int $size) {
     return $this->set(Class_User_Setting::SEARCH_PAGE_SIZE, $size);
   }
 
diff --git a/tests/scenarios/Templates/TemplatesUserSettingsTest.php b/tests/scenarios/Templates/TemplatesUserSettingsTest.php
index 01eeba821b07bae1f63696b74f0b73b719193fa0..280fc65842372fd013b82cddb23ef6bff73c5434 100644
--- a/tests/scenarios/Templates/TemplatesUserSettingsTest.php
+++ b/tests/scenarios/Templates/TemplatesUserSettingsTest.php
@@ -1,4 +1,4 @@
-<?php
+><?php
 /**
  * Copyright (c) 2012-2021, Agence Française Informatique (AFI). All rights reserved.
  *
@@ -370,3 +370,36 @@ class TemplatesUserSettingsSearchSaveChiliAndDomainBDAndWidgetDomainTest extends
                         Zend_Registry::get('sql')->getFirstAttributeForLastCallOn('fetchAll'));
   }
 }
+
+
+
+
+class TemplateUserSettingsWithCorruptedDataTest extends AbstractControllerTestCase {
+  public function setUp() {
+    parent::setUp();
+    $this->_buildTemplateProfil(['id' => 1]);
+
+    $john = $this->fixture(Class_Users::class,
+                   ['id' => 5,
+                    'login' => 'John',
+                    'password' => 'motdepasse',
+                    'settings' => 'a:5:{s:11:"library_ids";s:0:"";s:12:"search_order";s:35:"date_creation desc, alpha_titre asc";s:13:"search_layout";s:1:"3";s:16:"search_page_size";s:12:"kreversi.png";s:13:"profile_image";s:41:"public/opac/images/abonnes/read_black.png";}'
+                   ]);
+    ZendAfi_Auth::getInstance()->logUser($john);
+
+    $this->fixture(Class_Notice::class,
+                   ['id' => 1]);
+
+    Zend_Registry::set('sql', $this->mock()
+                       ->whenCalled('fetchAll')
+                       ->answers([[1,'']]));
+
+    $this->dispatch('/recherche/pomme');
+  }
+
+
+  /** @test */
+  public function pageSizeShouldBeTen() {
+    $this->assertXPathContentContains('//div[@class="selector_widget"]//form//select[contains(@onchange, "page_size/\'+value")]/option[@value=10][@selected]', '10');
+  }
+}