Error log in debug log

Hi,
I try to post data in json format but when I check debug log there is only error log with this :
Array
(
[0] => WP_Error Object
(
[errors] => Array
(
[json-error] => Array
(
[0] => 4
)

)

[error_data] => Array
(
)

)

)
but nothing in called url, nothing in params and nothing in remote server results
And i should have error or succes message. Can you help me with this ?

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