diff --git a/whois/error.py b/whois/error.py
index e69de29..127f42b 100644
--- a/whois/error.py
+++ b/whois/error.py
@@ -0,0 +1,6 @@
+# -*- coding: utf-8 -*-
+
+class InvalidInputText(Exception):
+	def __init__(self, text):
+		self.message = "Invalid input text: %s"%(text)
+		Exception.__init__(self, self.message)
diff --git a/whois/parser.py b/whois/parser.py
index 79e1520..2b111cc 100644
--- a/whois/parser.py
+++ b/whois/parser.py
@@ -46,6 +46,10 @@ class Parser(object):
 			logging.debug("__init__: DEBUG is set to True")
 
 		self.domain = unicode(domain, "utf-8").encode("idna")
+
+		if not text: 
+			raise error.InvalidInputText(text)
+
 		self.text = text
 		self.whoisServer = whoisServer and whoisServer or "default"