diff --git a/models/topology.go b/models/topology.go
index b799d721..7416ea1f 100644
--- a/models/topology.go
+++ b/models/topology.go
@@ -33,7 +33,7 @@ func (t Topology) OnConflictClause() clause.OnConflict {
 			Exprs: []clause.Expression{
 				clause.And(
 					clause.Eq{Column: "deleted_at"},
-					clause.Eq{Column: "agent_id", Value: uuid.Nil.String()},
+					clause.Expr{SQL: "agent_id = '00000000-0000-0000-0000-000000000000'::uuid", WithoutParentheses: true},
 				),
 			},
 		},