diff --git a/frappe/patches/v12_0/replace_null_values_in_tables.py b/frappe/patches/v12_0/replace_null_values_in_tables.py
index e2895ed6f7..023a255a6d 100644
--- a/frappe/patches/v12_0/replace_null_values_in_tables.py
+++ b/frappe/patches/v12_0/replace_null_values_in_tables.py
@@ -1,4 +1,5 @@
 import frappe
+import re
 
 def execute():
 	fields = frappe.db.sql("""
@@ -14,7 +15,7 @@ def execute():
 		update_column_table_map[field.TABLE_NAME].append("`{fieldname}`=COALESCE(`{fieldname}`, 0)".format(fieldname=field.COLUMN_NAME))
 
 	for table in frappe.db.get_tables():
-		if update_column_table_map.get(table):
+		if update_column_table_map.get(table) and frappe.db.exists("DocType", re.sub('^tab', '', table)):
 			frappe.db.sql("""UPDATE `{table}` SET {columns}"""
 				.format(table=table, columns=", ".join(update_column_table_map.get(table))))