Why does this cause a low byte fault

[druid]

static Boolean frmMain_fldName_OnfldEnter(EventPtr event)
{
        // Insert code for fldName
        FormPtr form;
        Boolean handled = false;
        form = FrmGetActiveForm();
        FrmSetFocus(form, FrmGetObjectIndex(form, fldName));
        SysKeyboardDialog(0);
        FldDrawField(fldName);
        return true;
}
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