diff --git a/erpnext/controllers/queries.py b/erpnext/controllers/queries.py
index a477a0d..0d64188 100644
--- a/erpnext/controllers/queries.py
+++ b/erpnext/controllers/queries.py
@@ -352,7 +352,9 @@
 	ifelse = CustomFunction("IF", ["condition", "then", "else"])
 
 	if filters and filters.get("customer"):
-		qb_filter_and_conditions.append(proj.customer == filters.get("customer"))
+		qb_filter_and_conditions.append(
+			(proj.customer == filters.get("customer")) | proj.customer.isnull() | proj.customer == ""
+		)
 
 	qb_filter_and_conditions.append(proj.status.notin(["Completed", "Cancelled"]))