diff --git a/htdocs/product/stock/class/productstockentrepot.class.php b/htdocs/product/stock/class/productstockentrepot.class.php
index 6b12af88c7a..740afcb5f04 100644
--- a/htdocs/product/stock/class/productstockentrepot.class.php
+++ b/htdocs/product/stock/class/productstockentrepot.class.php
@@ -93,8 +93,8 @@ class ProductStockEntrepot extends CommonObject
 
 		// Clean parameters
 
-		if (isset($this->fk_product)) $this->fk_product = trim($this->fk_product);
-		if (isset($this->fk_entrepot)) $this->fk_entrepot = trim($this->fk_entrepot);
+		if (isset($this->fk_product)) $this->fk_product = (int) $this->fk_product;
+		if (isset($this->fk_entrepot)) $this->fk_entrepot = (int) $this->fk_entrepot;
 		if (isset($this->seuil_stock_alerte)) $this->seuil_stock_alerte = trim($this->seuil_stock_alerte);
 		if (isset($this->desiredstock)) $this->desiredstock = trim($this->desiredstock);
 		if (isset($this->import_key)) $this->import_key = trim($this->import_key);
@@ -317,8 +317,8 @@ class ProductStockEntrepot extends CommonObject
 
 		// Clean parameters
 
-		if (isset($this->fk_product)) $this->fk_product = trim($this->fk_product);
-		if (isset($this->fk_entrepot)) $this->fk_entrepot = trim($this->fk_entrepot);
+		if (isset($this->fk_product)) $this->fk_product = (int) $this->fk_product;
+		if (isset($this->fk_entrepot)) $this->fk_entrepot = (int) $this->fk_entrepot;
 		if (isset($this->seuil_stock_alerte)) $this->seuil_stock_alerte = trim($this->seuil_stock_alerte);
 		if (isset($this->desiredstock)) $this->desiredstock = trim($this->desiredstock);
 		if (isset($this->import_key)) $this->import_key = trim($this->import_key);
@@ -575,8 +575,8 @@ class ProductStockEntrepot extends CommonObject
 		$this->id = 0;
 
 		$this->tms = '';
-		$this->fk_product = '';
-		$this->fk_entrepot = '';
+		$this->fk_product = null;
+		$this->fk_entrepot = null;
 		$this->seuil_stock_alerte = '';
 		$this->desiredstock = '';
 		$this->import_key = '';