Bug when installing new dev site [Key column 'lft' doesn't exist in table]

There is a bug when migrating a new dev site:

This error occurs after I have restored my database from v8.x.x and the execute bench migrate

Executing erpnext.patches.v11_0.add_index_on_nestedset_doctypes in site1.local (1bd3e0294da19198)
Traceback (most recent call last):
  File "/usr/lib/python3.5/runpy.py", line 184, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.5/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/utils/bench_helper.py", line 97, in <module>
    main()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/utils/bench_helper.py", line 18, in main
    click.Group(commands=commands)(prog_name='bench')
  File "/home/frappe/frappe-bench/env/lib/python3.5/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/home/frappe/frappe-bench/env/lib/python3.5/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/home/frappe/frappe-bench/env/lib/python3.5/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/frappe/frappe-bench/env/lib/python3.5/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/frappe/frappe-bench/env/lib/python3.5/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/frappe/frappe-bench/env/lib/python3.5/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/home/frappe/frappe-bench/env/lib/python3.5/site-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/commands/__init__.py", line 25, in _func
    ret = f(frappe._dict(ctx.obj), *args, **kwargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/commands/site.py", line 222, in migrate
    migrate(context.verbose, rebuild_website=rebuild_website)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/migrate.py", line 39, in migrate
    frappe.modules.patch_handler.run_all()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/modules/patch_handler.py", line 29, in run_all
    if not run_single(patchmodule = patch):
  File "/home/frappe/frappe-bench/apps/frappe/frappe/modules/patch_handler.py", line 63, in run_single
    return execute_patch(patchmodule, method, methodargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/modules/patch_handler.py", line 83, in execute_patch
    frappe.get_attr(patchmodule.split()[0] + ".execute")()
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/patches/v11_0/add_index_on_nestedset_doctypes.py", line 9, in execute
    frappe.get_doc("DocType", dt).run_module_method("on_doctype_update")
  File "/home/frappe/frappe-bench/apps/frappe/frappe/core/doctype/doctype/doctype.py", line 300, in run_module_method
    getattr(module, method)()
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/projects/doctype/task/task.py", line 241, in on_doctype_update
    frappe.db.add_index("Task", ["lft", "rgt"])
  File "/home/frappe/frappe-bench/apps/frappe/frappe/database.py", line 898, in add_index
    add index `%s`(%s)""" % (doctype, index_name, ", ".join(fields)))
  File "/home/frappe/frappe-bench/apps/frappe/frappe/database.py", line 205, in sql
    self._cursor.execute(query)
  File "/home/frappe/frappe-bench/env/lib/python3.5/site-packages/pymysql/cursors.py", line 165, in execute
    result = self._query(query)
  File "/home/frappe/frappe-bench/env/lib/python3.5/site-packages/pymysql/cursors.py", line 321, in _query
    conn.query(q)
  File "/home/frappe/frappe-bench/env/lib/python3.5/site-packages/pymysql/connections.py", line 860, in query
    self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  File "/home/frappe/frappe-bench/env/lib/python3.5/site-packages/pymysql/connections.py", line 1061, in _read_query_result
    result.read()
  File "/home/frappe/frappe-bench/env/lib/python3.5/site-packages/pymysql/connections.py", line 1349, in read
    first_packet = self.connection._read_packet()
  File "/home/frappe/frappe-bench/env/lib/python3.5/site-packages/pymysql/connections.py", line 1018, in _read_packet
    packet.check_error()
  File "/home/frappe/frappe-bench/env/lib/python3.5/site-packages/pymysql/connections.py", line 384, in check_error
    err.raise_mysql_exception(self._data)
  File "/home/frappe/frappe-bench/env/lib/python3.5/site-packages/pymysql/err.py", line 107, in raise_mysql_exception
    raise errorclass(errno, errval)
pymysql.err.InternalError: (1072, "Key column 'lft' doesn't exist in table")

Any update on this?

Any idea on this?