Configuration to reproduce the issue:
```
set load-balancing haproxy backend FRONTEND balance 'least-connection'
set load-balancing haproxy backend FRONTEND mode 'tcp'
set load-balancing haproxy backend FRONTEND server FRONTEND1 address '192.168.0.1'
set load-balancing haproxy backend FRONTEND server FRONTEND1 check port '5223'
set load-balancing haproxy backend FRONTEND server FRONTEND1 port '5223'
set load-balancing haproxy backend FRONTEND server FRONTEND2 address '192.0.2.1'
set load-balancing haproxy backend FRONTEND server FRONTEND2 check port '5223'
set load-balancing haproxy backend FRONTEND server FRONTEND2 port '5223'
set load-balancing haproxy backend FRONTEND timeout check '10'
set load-balancing haproxy backend FRONTEND timeout connect '10'
set load-balancing haproxy backend FRONTEND timeout server '10'
set load-balancing haproxy global-parameters tls-version-min '1.3'
set load-balancing haproxy service FRONTEND backend 'FRONTEND'
set load-balancing haproxy service FRONTEND listen-address 192.0.2.1
set load-balancing haproxy service FRONTEND mode 'tcp'
set load-balancing haproxy service FRONTEND port '5223'
set load-balancing haproxy service FRONTEND timeout client '10'
set load-balancing haproxy timeout check '10'
set load-balancing haproxy timeout client '10'
set load-balancing haproxy timeout connect '10'
set load-balancing haproxy timeout server '10'
set load-balancing haproxy global-parameters max-connections '2000000'
```
The commit is successful, but the op-cmd fails with following error:
```
vyos@vyos# run sh haproxy
Traceback (most recent call last):
Error: [Errno 2] No such file or directory
File "/usr/libexec/vyos/op_mode/load-balancing_haproxy.py", line 232, in <module>
res = vyos.opmode.run(sys.modules[__name__])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3/dist-packages/vyos/opmode.py", line 313, in run
res = func(**args)
^^^^^^^^^^^^
File "/usr/libexec/vyos/op_mode/load-balancing_haproxy.py", line 223, in show
data = _get_raw_data()
^^^^^^^^^^^^^^^
File "/usr/libexec/vyos/op_mode/load-balancing_haproxy.py", line 148, in _get_raw_data
data = json.loads(_get_json_data())
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/json/__init__.py", line 339, in loads
raise TypeError(f'the JSON object must be str, bytes or bytearray, '
TypeError: the JSON object must be str, bytes or bytearray, not NoneType
```
It does not throw this error if it is deleted and re-added again. The error is also found for the values in the same range.