diff --git a/erpnext/patches.txt b/erpnext/patches.txt
index c6472109b1..0f32a6dbf6 100644
--- a/erpnext/patches.txt
+++ b/erpnext/patches.txt
@@ -166,4 +166,6 @@ erpnext.patches.v5_0.portal_fixes
 erpnext.patches.v5_0.reset_values_in_tools
 execute:frappe.delete_doc("Page", "users")
 erpnext.patches.v5_0.update_material_transferred_for_manufacturing_again
-erpnext.patches.v5_0.index_on_account_and_gl_entry
\ No newline at end of file
+erpnext.patches.v5_0.index_on_account_and_gl_entry
+execute:frappe.db.sql("""delete from `tabProject Task`""")
+
diff --git a/erpnext/projects/doctype/project/project.py b/erpnext/projects/doctype/project/project.py
index 05e40388bf..0ba368d5ba 100644
--- a/erpnext/projects/doctype/project/project.py
+++ b/erpnext/projects/doctype/project/project.py
@@ -35,6 +35,7 @@ class Project(Document):
 	def validate(self):
 		self.validate_dates()
 		self.sync_tasks()
+		self.tasks = []
 
 	def validate_dates(self):
 		if self.expected_start_date and self.expected_end_date:
@@ -70,8 +71,6 @@ class Project(Document):
 		for t in frappe.get_all("Task", ["name"], {"project": self.name, "name": ("not in", task_names)}):
 			frappe.delete_doc("Task", t.name)
 
-		self.tasks = []
-
 	def update_percent_complete(self):
 		total = frappe.db.sql("""select count(*) from tabTask where project=%s""",
 			self.name)[0][0]