diff --git a/htdocs/expedition/card.php b/htdocs/expedition/card.php
index d509c0ff5b1..7d1b5e76637 100644
--- a/htdocs/expedition/card.php
+++ b/htdocs/expedition/card.php
@@ -308,10 +308,10 @@ if (empty($reshook)) {
 			$object->origin_type = $origin;
 			$object->origin_id = $origin_id;
 			$object->fk_project = GETPOSTINT('projectid');
-			$object->weight = GETPOST('weight') == '' ? "NULL" : GETPOSTFLOAT('weight');
-			$object->sizeH = GETPOST('sizeH') == '' ? "NULL" : GETPOSTFLOAT('sizeH');
-			$object->sizeW = GETPOST('sizeW') == '' ? "NULL" : GETPOSTFLOAT('sizeW');
-			$object->sizeS = GETPOST('sizeS') == '' ? "NULL" : GETPOSTFLOAT('sizeS');
+			$object->weight = GETPOST('weight') == '' ? '' : GETPOSTFLOAT('weight');
+			$object->sizeH = GETPOST('sizeH') == '' ? '' : GETPOSTFLOAT('sizeH');
+			$object->sizeW = GETPOST('sizeW') == '' ? '' : GETPOSTFLOAT('sizeW');
+			$object->sizeS = GETPOST('sizeS') == '' ? '' : GETPOSTFLOAT('sizeS');
 			$object->size_units = GETPOSTINT('size_units');
 			$object->weight_units = GETPOSTINT('weight_units');
 			$object->ref_customer = GETPOST('ref_customer', 'alpha');
@@ -350,10 +350,10 @@ if (empty($reshook)) {
 			$object->origin_type = $origin;
 			$object->origin_id = $origin_id;
 			$object->fk_project = GETPOSTINT('projectid');
-			$object->weight = GETPOST('weight') == '' ? "NULL" : GETPOSTFLOAT('weight');
-			$object->sizeH = GETPOST('sizeH') == '' ? "NULL" : GETPOSTFLOAT('sizeH');
-			$object->sizeW = GETPOST('sizeW') == '' ? "NULL" : GETPOSTFLOAT('sizeW');
-			$object->sizeS = GETPOST('sizeS') == '' ? "NULL" : GETPOSTFLOAT('sizeS');
+			$object->weight = GETPOST('weight') == '' ? '' : GETPOSTFLOAT('weight');
+			$object->sizeH = GETPOST('sizeH') == '' ? '' : GETPOSTFLOAT('sizeH');
+			$object->sizeW = GETPOST('sizeW') == '' ? '' : GETPOSTFLOAT('sizeW');
+			$object->sizeS = GETPOST('sizeS') == '' ? '' : GETPOSTFLOAT('sizeS');
 			$object->size_units = GETPOSTINT('size_units');
 			$object->weight_units = GETPOSTINT('weight_units');
 			$object->ref_customer = GETPOST('ref_customer', 'alpha');
diff --git a/htdocs/expedition/class/expedition.class.php b/htdocs/expedition/class/expedition.class.php
index 60d870b4ef6..d9d5d1d7911 100644
--- a/htdocs/expedition/class/expedition.class.php
+++ b/htdocs/expedition/class/expedition.class.php
@@ -152,7 +152,7 @@ class Expedition extends CommonObject
 	public $billed;
 
 	/**
-	 * @var null|int|string
+	 * @var null|int|float|''
 	 */
 	public $trueWeight;
 	/**
@@ -160,7 +160,7 @@ class Expedition extends CommonObject
 	 */
 	public $weight_units;
 	/**
-	 * @var null|int|string
+	 * @var null|int|float|''
 	 */
 	public $trueWidth;
 	/**
@@ -168,7 +168,7 @@ class Expedition extends CommonObject
 	 */
 	public $width_units;
 	/**
-	 * @var null|int|string
+	 * @var null|int|float|''
 	 */
 	public $trueHeight;
 	/**
@@ -176,7 +176,7 @@ class Expedition extends CommonObject
 	 */
 	public $height_units;
 	/**
-	 * @var null|int|string
+	 * @var null|int|float|''
 	 */
 	public $trueDepth;
 	/**
@@ -184,7 +184,7 @@ class Expedition extends CommonObject
 	 */
 	public $depth_units;
 	/**
-	 * @var null|string A denormalized value
+	 * @var null|int|float|'' A denormalized value
 	 */
 	public $trueSize;