diff --git a/cmd/pulls/merge.go b/cmd/pulls/merge.go
index bb705e6..829b271 100644
--- a/cmd/pulls/merge.go
+++ b/cmd/pulls/merge.go
@@ -44,18 +44,16 @@ var CmdPullsMerge = cli.Command{
 		ctx := context.InitCommand(cmd)
 		ctx.Ensure(context.CtxRequirement{RemoteRepo: true})
 
-		var idx int64
-		var err error
-		if ctx.Args().Len() == 1 {
-			idx, err = utils.ArgToIndex(ctx.Args().First())
-			if err != nil {
-				return err
-			}
-		} else {
+		if ctx.Args().Len() != 1 {
 			// If no PR index is provided, try interactive mode
 			return interact.MergePull(ctx)
 		}
 
+		idx, err := utils.ArgToIndex(ctx.Args().First())
+		if err != nil {
+			return err
+		}
+
 		return task.PullMerge(ctx.Login, ctx.Owner, ctx.Repo, idx, gitea.MergePullRequestOption{
 			Style:   gitea.MergeStyle(ctx.String("style")),
 			Title:   ctx.String("title"),