diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 1b497120e54..48be736362c 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -7178,7 +7178,7 @@ function price($amount, $form = 0, $outlangs = '', $trunc = 1, $rounding = -1, $
  *	Function to use on each input amount before any numeric test or database insert. A better name for this function
  *  should be roundtext2num().
  *
- *	@param	int|float|string	$amount		Amount to convert/clean or round
+ *	@param	int|float|string|null	$amount		Amount to convert/clean or round
  *	@param	''|'MU'|'MT'|'MS'|'CU'|'CT'|int<0,max>	$rounding		''=No rounding
  *                                                                  'MU'=Round to Max unit price (MAIN_MAX_DECIMALS_UNIT)
  *                                                                  'MT'=Round to Max for totals with Tax (MAIN_MAX_DECIMALS_TOT)
diff --git a/htdocs/fourn/ajax/getSupplierPrices.php b/htdocs/fourn/ajax/getSupplierPrices.php
index 2d0d838cabc..08385b342a4 100644
--- a/htdocs/fourn/ajax/getSupplierPrices.php
+++ b/htdocs/fourn/ajax/getSupplierPrices.php
@@ -122,7 +122,7 @@ if ($idprod > 0) {
 			}
 		}
 
-		$prices[] = array("id" => 'pmpprice', "price" => price2num((float) $price, 'MU'), "label" => $langs->trans("PMPValueShort").': '.price($price, 0, $langs, 0, 0, -1, $conf->currency), "title" => $langs->trans("PMPValueShort").': '.price($price, 0, $langs, 0, 0, -1, $conf->currency));  // For price field, we must use price2num(), for label or title, price()
+		$prices[] = array("id" => 'pmpprice', "price" => price2num($price, 'MU'), "label" => $langs->trans("PMPValueShort").': '.price($price, 0, $langs, 0, 0, -1, $conf->currency), "title" => $langs->trans("PMPValueShort").': '.price($price, 0, $langs, 0, 0, -1, $conf->currency));  // For price field, we must use price2num(), for label or title, price()
 	}
 
 	// Add price for costprice (at end)
diff --git a/htdocs/product/class/product.class.php b/htdocs/product/class/product.class.php
index f9834f88e51..cecda57430f 100644
--- a/htdocs/product/class/product.class.php
+++ b/htdocs/product/class/product.class.php
@@ -6111,7 +6111,7 @@ class Product extends CommonObject
 	 * @param	float			$nbpiece		nb of units (should be always positive, use $movement to decide if we add or remove)
 	 * @param	int<0,1>		$movement		0 = add, 1 = remove
 	 * @param	string			$label			Label of stock movement
-	 * @param	float			$price			Unit price HT of product, used to calculate average weighted price (PMP in french). If 0, average weighted price is not changed.
+	 * @param	int|float		$price			Unit price HT of product, used to calculate average weighted price (PMP in french). If 0, average weighted price is not changed.
 	 * @param	string			$inventorycode	Inventory code
 	 * @param	string			$origin_element	Origin element type
 	 * @param	?int			$origin_id		Origin id of element
diff --git a/htdocs/product/inventory/inventory.php b/htdocs/product/inventory/inventory.php
index 73f6fd0134f..a0835b81ffb 100644
--- a/htdocs/product/inventory/inventory.php
+++ b/htdocs/product/inventory/inventory.php
@@ -1198,7 +1198,7 @@ if ($resql) {
 			print '</td>';
 		} else {
 			if (getDolGlobalString('INVENTORY_MANAGE_REAL_PMP')) {
-				//PMP Expected
+				// PMP Expected
 				if (!empty($obj->pmp_expected)) {
 					$pmp_expected = $obj->pmp_expected;
 				} else {
@@ -1206,7 +1206,7 @@ if ($resql) {
 				}
 				$pmp_valuation = $pmp_expected * $valuetoshow;
 				print '<td class="right">';
-				print price($pmp_expected);
+				print is_null($pmp_expected) ? '' : price($pmp_expected);
 				print '</td>';
 				print '<td class="right">';
 				print price($pmp_valuation);
@@ -1216,7 +1216,7 @@ if ($resql) {
 				print $obj->qty_view;	// qty found
 				print '</td>';
 
-				//PMP Real
+				// PMP Real
 				print '<td class="right">';
 				if (!empty($obj->pmp_real)) {
 					$pmp_real = $obj->pmp_real;
@@ -1224,7 +1224,7 @@ if ($resql) {
 					$pmp_real = $product_static->pmp;
 				}
 				$pmp_valuation_real = $pmp_real * $obj->qty_view;
-				print price($pmp_real);
+				print is_null($pmp_real) ? '' : price($pmp_real);
 				print '</td>';
 				print '<td class="right">';
 				print price($pmp_valuation_real);
diff --git a/htdocs/product/stock/massstockmove.php b/htdocs/product/stock/massstockmove.php
index 362cd716b9b..9abd5d83716 100644
--- a/htdocs/product/stock/massstockmove.php
+++ b/htdocs/product/stock/massstockmove.php
@@ -216,7 +216,7 @@ if ($action == 'createmovements' && $user->hasRight('stock', 'mouvement', 'creer
 				// Define value of products moved
 				$pricesrc = 0;
 				if (!empty($product->pmp)) {
-					$pricesrc = $product->pmp;
+					$pricesrc = (float) $product->pmp;
 				}
 				$pricedest = $pricesrc;