diff --git a/webnotes/model/rename_doc.py b/webnotes/model/rename_doc.py
index b2c4e8c3e8..e694521f96 100644
--- a/webnotes/model/rename_doc.py
+++ b/webnotes/model/rename_doc.py
@@ -101,7 +101,8 @@ def rename_doctype(doctype, old, new, force=False):
 def rename_mapper(new):
 	for mapper in webnotes.conn.sql("""select name, from_doctype, to_doctype 
 			from `tabDocType Mapper` where from_doctype=%s or to_doctype=%s""", (new, new), as_dict=1):
-		rename_doc("DocType Mapper", mapper.name, mapper.from_doctype + "-" + mapper.to_doctype, force=True)
+		if not webnotes.conn.exists("DocType Mapper", mapper.from_doctype + "-" + mapper.to_doctype):
+			rename_doc("DocType Mapper", mapper.name, mapper.from_doctype + "-" + mapper.to_doctype, force=True)
 		
 def update_child_docs(old, new, doclist):
 	# update "parent"