diff --git a/Java/Regex.java b/Java/Regex.java
index c9f7c05..aee5301 100644
--- a/Java/Regex.java
+++ b/Java/Regex.java
@@ -1,5 +1,5 @@
 
 
 public static boolean isIp(String ip) {
-	return ip.matches("^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$");
+	return ip != null && !ip.equals("") && ip.matches("^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$");
 }