diff --git a/htdocs/fourn/class/fournisseur.facture.class.php b/htdocs/fourn/class/fournisseur.facture.class.php
index 845053a4d89..7c733bc8f5a 100644
--- a/htdocs/fourn/class/fournisseur.facture.class.php
+++ b/htdocs/fourn/class/fournisseur.facture.class.php
@@ -2102,7 +2102,7 @@ class FactureFournisseur extends CommonInvoice
 			$remise_percent = price2num($remise_percent);
 			$qty = price2num($qty);
 			$pu = price2num($pu);
-			if (!preg_match('/\((.*)\)/', $txtva)) {
+			if (!preg_match('/\((.*)\)/', (string) $txtva)) {
 				$txtva = price2num($txtva); // $txtva can have format '5,1' or '5.1' or '5.1(XXX)', we must clean only if '5,1'
 			}
 			$txlocaltax1 = price2num($txlocaltax1);
@@ -2224,7 +2224,7 @@ class FactureFournisseur extends CommonInvoice
 			$supplierinvoiceline->desc = $desc;
 			$supplierinvoiceline->ref_supplier = $ref_supplier;
 
-			$supplierinvoiceline->qty = ($this->type == self::TYPE_CREDIT_NOTE ? abs($qty) : $qty); // For credit note, quantity is always positive and unit price negative
+			$supplierinvoiceline->qty = ($this->type == self::TYPE_CREDIT_NOTE ? abs((float) $qty) : $qty); // For credit note, quantity is always positive and unit price negative
 			$supplierinvoiceline->subprice = ($this->type == self::TYPE_CREDIT_NOTE ? -abs($pu_ht) : $pu_ht); // For credit note, unit price always negative, always positive otherwise
 
 			$supplierinvoiceline->vat_src_code = $vat_src_code;
@@ -2377,9 +2377,9 @@ class FactureFournisseur extends CommonInvoice
 
 		// Clean vat code
 		$vat_src_code = '';
-		if (preg_match('/\((.*)\)/', $vatrate, $reg)) {
+		if (preg_match('/\((.*)\)/', (string) $vatrate, $reg)) {
 			$vat_src_code = $reg[1];
-			$vatrate = preg_replace('/\s*\(.*\)/', '', $vatrate); // Remove code into vatrate.
+			$vatrate = preg_replace('/\s*\(.*\)/', '', (string) $vatrate); // Remove code into vatrate.
 		}
 
 		$tabprice = calcul_price_total($qty, $pu, $remise_percent, $vatrate, $txlocaltax1, $txlocaltax2, 0, $price_base_type, $info_bits, $type, $this->thirdparty, $localtaxes_type, 100, $this->multicurrency_tx, $pu_devise);
@@ -2424,7 +2424,7 @@ class FactureFournisseur extends CommonInvoice
 		$line->description = $desc;
 		$line->desc = $desc;
 
-		$line->qty = ($this->type == self::TYPE_CREDIT_NOTE ? abs($qty) : $qty); // For credit note, quantity is always positive and unit price negative
+		$line->qty = ($this->type == self::TYPE_CREDIT_NOTE ? abs((float) $qty) : $qty); // For credit note, quantity is always positive and unit price negative
 		$line->subprice = ($this->type == self::TYPE_CREDIT_NOTE ? -abs($pu_ht) : $pu_ht); // For credit note, unit price always negative, always positive otherwise
 		$line->pu_ht = ($this->type == self::TYPE_CREDIT_NOTE ? -abs($pu_ht) : $pu_ht); // For credit note, unit price always negative, always positive otherwise
 		$line->pu_ttc = ($this->type == self::TYPE_CREDIT_NOTE ? -abs($pu_ttc) : $pu_ttc); // For credit note, unit price always negative, always positive otherwise