diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 05024437a63..d62882d9ef6 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -5733,7 +5733,7 @@ function make_substitutions($text, $substitutionarray, $outputlangs=null)
 	// Make substitition for array $substitutionarray
 	foreach ($substitutionarray as $key => $value)
 	{
-		if (! isset($value)) continue;	// If value is null, it same than not having substitution key at all into array, we do not replace.
+		//if (! isset($value)) continue;	// If value is null, it same than not having substitution key at all into array, we do not replace.
 
 		if ($key == '__SIGNATURE__' && (! empty($conf->global->MAIN_MAIL_DO_NOT_USE_SIGN))) $value='';		// Protection
 		if ($key == '__USER_SIGNATURE__' && (! empty($conf->global->MAIN_MAIL_DO_NOT_USE_SIGN))) $value='';	// Protection