diff --git a/api/src/org/labkey/api/exp/property/AbstractDomainKind.java b/api/src/org/labkey/api/exp/property/AbstractDomainKind.java
index e14631cbcbd..5ded66b0c70 100644
--- a/api/src/org/labkey/api/exp/property/AbstractDomainKind.java
+++ b/api/src/org/labkey/api/exp/property/AbstractDomainKind.java
@@ -206,7 +206,7 @@ protected boolean getBlanksSql(Domain domain, DomainProperty prop, SQLFragment b
         else
         {
             // Issue 29047
-            blankRowsSQL.appendIdentifier(columnId).append(" IS NOT NULL");
+            blankRowsSQL.appendIdentifier(columnId).append(" IS NULL");
         }
         if (prop.isMvEnabled())
         {