Check if doctype exists before renaming
diff --git a/erpnext/patches/v7_2/update_assessment_modules.py b/erpnext/patches/v7_2/update_assessment_modules.py
index ec85770..9075bbf 100644
--- a/erpnext/patches/v7_2/update_assessment_modules.py
+++ b/erpnext/patches/v7_2/update_assessment_modules.py
@@ -3,14 +3,17 @@
 
 def execute():
 	#Rename Grading Structure to Grading Scale
-	frappe.rename_doc("DocType", "Grading Structure", "Grading Scale", force=True)
-	frappe.rename_doc("DocType", "Grade Interval", "Grading Scale Interval", force=True)
+	if not frappe.db.exists("DocType", "Grading Scale"):
+		frappe.rename_doc("DocType", "Grading Structure", "Grading Scale", force=True)
+	if not frappe.db.exists("DocType", "Grading Scale Interval"):
+		frappe.rename_doc("DocType", "Grade Interval", "Grading Scale Interval", force=True)
 
 	frappe.reload_doc("schools", "doctype", "grading_scale_interval")
 	if "to_score" in frappe.db.get_table_columns("Grading Scale Interval"):
 		rename_field("Grading Scale Interval", "to_score", "threshold")
 
-	frappe.rename_doc("DocType", "Assessment", "Assessment Plan", force=True)
+	if not frappe.db.exists("DocType", "Assessment Plan"):
+		frappe.rename_doc("DocType", "Assessment", "Assessment Plan", force=True)
 
 	#Rename Assessment Results
 	frappe.reload_doc("schools", "doctype", "assessment_plan")
@@ -22,9 +25,10 @@
 	frappe.reload_doc("schools", "doctype", "assessment_criteria")
 
 
-	for assessment in frappe.get_all("Assessment Plan", fields=["name", "grading_scale"], filters = [["docstatus", "!=", 2 ]]):
-		print assessment
-		for stud_result in frappe.db.sql("select * from `tabAssessment Result` where parent= %s", assessment.name, as_dict=True):
+	for assessment in frappe.get_all("Assessment Plan", 
+			fields=["name", "grading_scale"], filters = [["docstatus", "!=", 2 ]]):
+		for stud_result in frappe.db.sql("select * from `tabAssessment Result` where parent= %s", 
+				assessment.name, as_dict=True):
 			if stud_result.result:
 				assessment_result = frappe.new_doc("Assessment Result")
 				assessment_result.student = stud_result.student