diff --git a/ChangeLog b/ChangeLog
index 3aae68b567a..c2dc484202a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -37,6 +37,7 @@ English Dolibarr ChangeLog
 - Fix: [ bug #2545 ] Missing object_margin.png in Amarok theme
 - Fix: [ bug #2542 ] Contracts store localtax preferences
 - Fix: Bad permission assignments for stock movements actions
+- Fix: [ bug #2891 ] Category hooks do not work
 
 ***** ChangeLog for 3.6.2 compared to 3.6.1 *****
 - Fix: fix ErrorBadValueForParamNotAString error message in price customer multiprice.
diff --git a/htdocs/categories/edit.php b/htdocs/categories/edit.php
index 0c61ab8cca6..cdca440da13 100644
--- a/htdocs/categories/edit.php
+++ b/htdocs/categories/edit.php
@@ -56,6 +56,9 @@ $object = new Categorie($db);
 $extrafields = new ExtraFields($db);
 $extralabels=$extrafields->fetch_name_optionals_label($object->table_element);
 
+// Initialize technical object to manage hooks. Note that conf->hooks_modules contains array array
+$hookmanager->initHooks(array('categorycard'));
+
 /*
  * Actions
  */
diff --git a/htdocs/categories/fiche.php b/htdocs/categories/fiche.php
index 208cbb38331..566249748de 100644
--- a/htdocs/categories/fiche.php
+++ b/htdocs/categories/fiche.php
@@ -64,6 +64,9 @@ $object = new Categorie($db);
 $extrafields = new ExtraFields($db);
 $extralabels=$extrafields->fetch_name_optionals_label($object->table_element);
 
+// Initialize technical object to manage hooks. Note that conf->hooks_modules contains array array
+$hookmanager->initHooks(array('categorycard'));
+
 /*
  *	Actions
  */
diff --git a/htdocs/categories/viewcat.php b/htdocs/categories/viewcat.php
index 010306d1e00..f9df0aff71e 100644
--- a/htdocs/categories/viewcat.php
+++ b/htdocs/categories/viewcat.php
@@ -63,6 +63,9 @@ $type=$object->type;
 $extrafields = new ExtraFields($db);
 $extralabels = $extrafields->fetch_name_optionals_label($object->table_element);
 
+// Initialize technical object to manage hooks. Note that conf->hooks_modules contains array array
+$hookmanager->initHooks(array('categorycard'));
+
 /*
  *	Actions
  */
diff --git a/htdocs/core/tpl/objectline_create.tpl.php b/htdocs/core/tpl/objectline_create.tpl.php
index 7262a3b3bd9..a8c9434acec 100644
--- a/htdocs/core/tpl/objectline_create.tpl.php
+++ b/htdocs/core/tpl/objectline_create.tpl.php
@@ -184,7 +184,7 @@ else {
 	<td align="right"><?php
 	if (GETPOST('prod_entry_mode') != 'predef')
 	{
-		if ($seller->tva_assuj == "0") echo '<input type="hidden" name="tva_tx" value="0">0';
+		if ($seller->tva_assuj == "0") echo '<input type="hidden" name="tva_tx" value="0"> '.vatrate(0, true);
 		else echo $form->load_tva('tva_tx', (isset($_POST["tva_tx"])?$_POST["tva_tx"]:-1), $seller, $buyer);
 	}
 	?>
diff --git a/htdocs/product/liste.php b/htdocs/product/liste.php
index 69453cb2a50..99b80644310 100644
--- a/htdocs/product/liste.php
+++ b/htdocs/product/liste.php
@@ -49,8 +49,8 @@ $sall=GETPOST("sall");
 $type=GETPOST("type","int");
 $search_sale = GETPOST("search_sale");
 $search_categ = GETPOST("search_categ",'int');
-$tosell = GETPOST("tosell");
-$tobuy = GETPOST("tobuy");
+$tosell = GETPOST("tosell", 'int');
+$tobuy = GETPOST("tobuy", 'int');
 $fourn_id = GETPOST("fourn_id",'int');
 $catid = GETPOST('catid','int');