How to open the Create Subtask Dialog without parentIssueId

Hello guys! I need open subtask dialog, but i can’t do it cause i should set parentIssueId. Another case it return me task, in subtask dialog.

Can i escape it?

 JIRA.Forms.createSubtaskForm({pid:1000, issueType:10001, parentIssueId: null}).asDialog({
                    windowTitle: function () {
                        return JIRA.Dialog.getIssueActionTitle("Create Subtask");
                    trigger: document.createElement("a"),
                    id: "create-subtask-dialog"