diff --git a/srcs/ft_isnumber.c b/srcs/ft_isnumber.c
index 6ecc6c5..0238943 100644
--- a/srcs/ft_isnumber.c
+++ b/srcs/ft_isnumber.c
@@ -8,6 +8,8 @@ int	ft_isnumber(char *nb)
 	i = 0;
 	if (nb[i] == '+' || nb[i] == '-')
 		i++;
+	if (nb[i] == '\0')
+		return (0);
 	while (nb[i] != '\0')
 	{
 		if (ft_isdigit(nb[i]) == 0)