diff --git a/pkg/util/ranger/ranger.go b/pkg/util/ranger/ranger.go
index 1f6255dc31223..5d2d0a9edc8aa 100644
--- a/pkg/util/ranger/ranger.go
+++ b/pkg/util/ranger/ranger.go
@@ -735,10 +735,8 @@ func points2EqOrInCond(ctx expression.BuildContext, points []*point, col *expres
 	retType := col.GetType(ctx.GetEvalCtx())
 	args := make([]expression.Expression, 0, len(points)/2)
 	args = append(args, col)
-	if len(points) == 2 {
-		if points[0].value.IsNull() && points[0].value.IsNull() {
-			return expression.NewFunctionInternal(ctx, ast.IsNull, retType, args...)
-		}
+	if len(points) == 2 && points[0].value.IsNull() && points[0].value.IsNull() {
+		return expression.NewFunctionInternal(ctx, ast.IsNull, retType, args...)
 	}
 	for i := 0; i < len(points); i = i + 2 {
 		value := &expression.Constant{