diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index a897009d78b..5ef51d98ed2 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -2523,6 +2523,7 @@ function price($amount, $form=0, $outlangs='', $trunc=1, $rounding=-1, $forcerou
 
 	// Clean parameters
 	if (empty($amount)) $amount=0;	// To have a numeric value if amount not defined or = ''
+	$amount = (is_numeric($value)?$value:0); // Check if amount is numeric, for example, an error occured when amount value = o (letter) instead 0 (number)
 	if ($rounding < 0) $rounding=min($conf->global->MAIN_MAX_DECIMALS_UNIT,$conf->global->MAIN_MAX_DECIMALS_TOT);
 
 	$nbdecimal=$rounding;