diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index f8551314ae6..701e4534786 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -2244,10 +2244,10 @@ function dolSlugify($stringtoslugify)
 /**
  *  Returns text escaped for inclusion into javascript code
  *
- *  @param	string	$stringtoescape			String to escape
- *  @param	int<0,3>	$mode				0=Escape also ' and " into ', 1=Escape ' but not " for usage into 'string', 2=Escape " but not ' for usage into "string", 3=Escape ' and " with \
- *  @param	int		$noescapebackslashn		0=Escape also \n. 1=Do not escape \n.
- *  @return string							Escaped string. Both ' and " are escaped into ' if they are escaped.
+ *  @param	int|string	$stringtoescape			String to escape
+ *  @param	int<0,3>	$mode					0=Escape also ' and " into ', 1=Escape ' but not " for usage into 'string', 2=Escape " but not ' for usage into "string", 3=Escape ' and " with \
+ *  @param	int			$noescapebackslashn		0=Escape also \n. 1=Do not escape \n.
+ *  @return string								Escaped string. Both ' and " are escaped into ' if they are escaped.
  */
 function dol_escape_js($stringtoescape, $mode = 0, $noescapebackslashn = 0)
 {
@@ -2273,7 +2273,7 @@ function dol_escape_js($stringtoescape, $mode = 0, $noescapebackslashn = 0)
 		$substitjs["'"] = "\\'";
 		$substitjs['"'] = "\\\"";
 	}
-	return strtr($stringtoescape, $substitjs);
+	return strtr((string) $stringtoescape, $substitjs);
 }
 
 /**