diff --git a/frappe/__version__.py b/frappe/__version__.py
index 29c39694fb..3a520d65e8 100644
--- a/frappe/__version__.py
+++ b/frappe/__version__.py
@@ -1,2 +1,2 @@
 from __future__ import unicode_literals
-__version__ = "4.13.5"
+__version__ = "4.13.6"
diff --git a/frappe/hooks.py b/frappe/hooks.py
index 8b6fafd18e..9c74b8cf7c 100644
--- a/frappe/hooks.py
+++ b/frappe/hooks.py
@@ -4,7 +4,7 @@ app_title = "Frappe Framework"
 app_publisher = "Web Notes Technologies Pvt. Ltd."
 app_description = "Full Stack Web Application Framework in Python"
 app_icon = "assets/frappe/images/frappe.svg"
-app_version = "4.13.5"
+app_version = "4.13.6"
 app_color = "#3498db"
 app_email = "support@frappe.io"
 
diff --git a/frappe/utils/__init__.py b/frappe/utils/__init__.py
index 7987f4614c..09becd9f9d 100644
--- a/frappe/utils/__init__.py
+++ b/frappe/utils/__init__.py
@@ -63,8 +63,13 @@ def extract_email_id(email):
 
 def validate_email_add(email_str):
 	"""Validates the email string"""
+	if email_str and " " in email_str and "<" not in email_str:
+		# example: "test@example.com test2@example.com" will return "test@example.comtest2" after parseaddr!!!
+		return False
+
 	email = extract_email_id(email_str)
 	match = re.match("[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?", email.lower())
+
 	if not match:
 		return False
 
diff --git a/frappe/utils/file_manager.py b/frappe/utils/file_manager.py
index e6a61789ed..b3194ecf7c 100644
--- a/frappe/utils/file_manager.py
+++ b/frappe/utils/file_manager.py
@@ -228,10 +228,14 @@ def delete_file_data_content(doc):
 
 def delete_file_from_filesystem(doc):
 	path = doc.file_name
+
 	if path.startswith("files/"):
 		path = frappe.utils.get_site_path("public", doc.file_name)
 	else:
 		path = frappe.utils.get_site_path("public", "files", doc.file_name)
+
+	path = encode(path)
+
 	if os.path.exists(path):
 		os.remove(path)
 
diff --git a/frappe/website/website_generator.py b/frappe/website/website_generator.py
index d1388634b4..57c83fefdb 100644
--- a/frappe/website/website_generator.py
+++ b/frappe/website/website_generator.py
@@ -96,16 +96,15 @@ class WebsiteGenerator(Document):
 
 			if old_route and old_route != self.get_route():
 				# clear cache of old routes
-				old_routes = frappe.get_all(self.doctype, fields=["parent_website_route", "page_name"],
-					filters={"parent_website_route": ("like", old_route + "%")})
+				old_routes = frappe.get_all(self.doctype, filters={"parent_website_route": ("like", old_route + "%")})
 
 				if old_routes:
-					for old_route in old_routes:
-						clear_cache(make_route(old_route))
+					for like_old_route in old_routes:
+						clear_cache(frappe.get_doc(self.doctype, like_old_route.name).get_route())
 
 					frappe.db.sql("""update `tab{0}` set
 						parent_website_route = replace(parent_website_route, %s, %s),
-						modified = %s
+						modified = %s,
 						modified_by = %s
 						where parent_website_route like %s""".format(self.doctype),
 						(old_route, self.get_route(), now(), frappe.session.user, old_route + "%"))
diff --git a/requirements.txt b/requirements.txt
index 1a431ed337..89ce2dd125 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ markupsafe
 mysql-python==1.2.5
 pygeoip
 python-dateutil
-python-memcached
+python-memcached==1.53
 pytz
 six
 slugify
diff --git a/setup.py b/setup.py
index 166e103f80..9340dfe961 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,7 @@
 from setuptools import setup, find_packages
 import os
 
-version = "4.13.5"
+version = "4.13.6"
 
 with open("requirements.txt", "r") as f:
 	install_requires = f.readlines()