Issue with migrating site

Hello all,

My website has been unresponsive for 2 days now. I tried migrating it, but got the below error.

Traceback (most recent call last):
  File "/usr/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/opt/erpnext/erpnext/apps/frappe/frappe/utils/bench_helper.py", line 101, in <module>
    main()
  File "/opt/erpnext/erpnext/apps/frappe/frappe/utils/bench_helper.py", line 18, in main
    click.Group(commands=commands)(prog_name='bench')
  File "/opt/erpnext/erpnext/env/lib/python3.6/site-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/opt/erpnext/erpnext/env/lib/python3.6/site-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/opt/erpnext/erpnext/env/lib/python3.6/site-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/opt/erpnext/erpnext/env/lib/python3.6/site-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/opt/erpnext/erpnext/env/lib/python3.6/site-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/opt/erpnext/erpnext/env/lib/python3.6/site-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/opt/erpnext/erpnext/env/lib/python3.6/site-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/opt/erpnext/erpnext/apps/frappe/frappe/commands/__init__.py", line 27, in _func
    ret = f(frappe._dict(ctx.obj), *args, **kwargs)
  File "/opt/erpnext/erpnext/apps/frappe/frappe/commands/site.py", line 300, in migrate
    skip_search_index=skip_search_index
  File "/opt/erpnext/erpnext/apps/frappe/frappe/migrate.py", line 62, in migrate
    for app in frappe.get_installed_apps():
  File "/opt/erpnext/erpnext/apps/frappe/frappe/__init__.py", line 983, in get_installed_apps
    installed = json.loads(db.get_global("installed_apps") or "[]")
  File "/opt/erpnext/erpnext/apps/frappe/frappe/database/database.py", line 713, in get_global
    return self.get_default(key, user)
  File "/opt/erpnext/erpnext/apps/frappe/frappe/database/database.py", line 717, in get_default
    d = self.get_defaults(key, parent)
  File "/opt/erpnext/erpnext/apps/frappe/frappe/database/database.py", line 735, in get_defaults
    defaults = frappe.defaults.get_defaults(parent)
  File "/opt/erpnext/erpnext/apps/frappe/frappe/defaults.py", line 77, in get_defaults
    globald = get_defaults_for()
  File "/opt/erpnext/erpnext/apps/frappe/frappe/defaults.py", line 204, in get_defaults_for
    where parent = %s order by creation""", (parent,), as_dict=1)
  File "/opt/erpnext/erpnext/apps/frappe/frappe/database/database.py", line 146, in sql
    self._cursor.execute(query, values)
  File "/opt/erpnext/erpnext/env/lib/python3.6/site-packages/pymysql/cursors.py", line 170, in execute
    result = self._query(query)
  File "/opt/erpnext/erpnext/env/lib/python3.6/site-packages/pymysql/cursors.py", line 328, in _query
    conn.query(q)
  File "/opt/erpnext/erpnext/env/lib/python3.6/site-packages/pymysql/connections.py", line 516, in query
    self._execute_command(COMMAND.COM_QUERY, sql)
  File "/opt/erpnext/erpnext/env/lib/python3.6/site-packages/pymysql/connections.py", line 750, in _execute_command
    raise err.InterfaceError("(0, '')")
pymysql.err.InterfaceError: (0, '')

Any help would be highly appreciated.
Thank you