diff --git a/htdocs/exports/class/export.class.php b/htdocs/exports/class/export.class.php
index ca85fad2e21..c5cc14d7fae 100644
--- a/htdocs/exports/class/export.class.php
+++ b/htdocs/exports/class/export.class.php
@@ -70,6 +70,9 @@ class Export
 	public $array_export_TypeFields = array(); // Tableau des listes de champ+Type de filtre
 	public $array_export_FilterValue = array(); // Tableau des listes de champ+Valeur a filtrer
 	public $array_export_entities = array(); // Tableau des listes de champ+alias a exporter
+	/**
+	 * @var array<int,array<string,string>>
+	 */
 	public $array_export_dependencies = array(); // array of list of entities that must take care of the DISTINCT if a field is added into export
 	public $array_export_special = array(); // array of special operations to do on field
 	public $array_export_examplevalues = array(); // array with examples for fields
diff --git a/htdocs/exports/export.php b/htdocs/exports/export.php
index 9262f6d5457..a88898faaa8 100644
--- a/htdocs/exports/export.php
+++ b/htdocs/exports/export.php
@@ -146,7 +146,7 @@ $step = GETPOSTINT("step") ? GETPOSTINT("step") : 1;
 $export_name = GETPOST("export_name", "alphanohtml");
 $hexa = GETPOST("hexa", "alpha");
 $exportmodelid = GETPOSTINT("exportmodelid");
-$field = GETPOST("field", "alpha");
+$field = (string) GETPOST("field", "alpha");
 
 $objexport = new Export($db);
 $objexport->load_arrays($user, $datatoexport);