--- a/displaySupplier.php
+++ b/displaySupplier.php
@@ -66,7 +66,7 @@
   $query = 'SELECT SUM("value") as val, MAX("supplierName") as supplierName, "supplierABN",(
  case when "supplierABN" != 0 THEN "supplierABN"::text ELSE "supplierName" END) as supplierID 
 FROM contractnotice
-WHERE "childCN" = 0
+WHERE "childCN" is null
 GROUP BY supplierID,"supplierABN"
 ORDER BY val DESC
 LIMIT 100';