diff --git a/erpnext/projects/doctype/project/project.py b/erpnext/projects/doctype/project/project.py
index d920a09..221c1d3 100644
--- a/erpnext/projects/doctype/project/project.py
+++ b/erpnext/projects/doctype/project/project.py
@@ -76,7 +76,7 @@
 	def validate_weights(self):
 		sum = 0
 		for task in self.tasks:
-			if task.task_weight > 0:
+			if task.task_weight or 0 > 0:
 				sum = sum + task.task_weight
 		if sum > 0 and sum != 1:
 			frappe.throw(_("Total of all task weights should be 1. Please adjust weights of all Project tasks accordingly"))