diff --git a/builder_test.go b/builder_test.go
new file mode 100644
index 0000000..425c2ab
--- /dev/null
+++ b/builder_test.go
@@ -0,0 +1,10 @@
+package db
+
+import "testing"
+
+func TestJoinSub(t *testing.T) {
+	b := NewBuilder(conn)
+	b.Grammar = &Sqlite3Grammar{}
+
+	t.Log(b.On("Select 1 as a, 2 as b", "t1", "true").ToSql())
+}
diff --git a/scan.go b/scan.go
index fa2d1ac..5da2857 100644
--- a/scan.go
+++ b/scan.go
@@ -6,6 +6,8 @@ import (
 	"errors"
 	"fmt"
 	"reflect"
+
+	"github.com/samber/lo"
 )
 
 type RowScan struct {
@@ -139,7 +141,7 @@ func sStructSlice(rows *sql.Rows, dest any) (result RowScan) {
 				if data := *scanArgs[i].(*[]uint8); len(data) > 0 {
 					v := rv.Addr().Interface()
 					if err := json.Unmarshal(data, &v); err != nil {
-						panic(fmt.Sprintf("[%s:%v] => %s", rv.Kind(), data, err))
+						panic(fmt.Sprintf("[%s:%s:%s] => %s", lo.Must1(lo.FindKey(keys, i)), rv.Kind(), data, err))
 					}
 				}
 			}
@@ -213,7 +215,7 @@ func sStruct(rows *sql.Rows, dest any) (result RowScan) {
 					if data := *scanArgs[i].(*[]uint8); len(data) > 0 {
 						v := rv.Addr().Interface()
 						if err := json.Unmarshal(data, &v); err != nil {
-							panic(fmt.Sprintf("[%s:%v] => %s", rv.Kind(), data, err))
+							panic(fmt.Sprintf("[%s:%s:%s] => %s", lo.Must1(lo.FindKey(keys, i)), rv.Kind(), data, err))
 						}
 					}
 				}