diff --git a/frappe/__init__.py b/frappe/__init__.py
index 33ac7f8861..ef199d120f 100644
--- a/frappe/__init__.py
+++ b/frappe/__init__.py
@@ -13,7 +13,7 @@ import os, importlib, inspect, json
 from .exceptions import *
 from .utils.jinja import get_jenv, get_template, render_template
 
-__version__ = "7.0.5"
+__version__ = "7.0.6"
 
 local = Local()
 
diff --git a/frappe/custom/doctype/custom_field/custom_field.py b/frappe/custom/doctype/custom_field/custom_field.py
index 8a7edfd319..11198be9f2 100644
--- a/frappe/custom/doctype/custom_field/custom_field.py
+++ b/frappe/custom/doctype/custom_field/custom_field.py
@@ -46,10 +46,11 @@ class CustomField(Document):
 			validate_fields_for_doctype(self.dt)
 
 		# update the schema
-		if (self.fieldname not in frappe.db.get_table_columns(self.dt)
-			or getattr(self, "_old_fieldtype", None) != self.fieldtype):
-			from frappe.model.db_schema import updatedb
-			updatedb(self.dt)
+		if not frappe.db.get_value('DocType', self.dt, 'issingle'):
+			if (self.fieldname not in frappe.db.get_table_columns(self.dt)
+				or getattr(self, "_old_fieldtype", None) != self.fieldtype):
+				from frappe.model.db_schema import updatedb
+				updatedb(self.dt)
 
 	def on_trash(self):
 		# delete property setter entries