Why does the Empty post ID error occur?

Question

Classmates

Good afternoon. My name is Nikolai, I manage SocialJet.ru
We publish promo posts on the social network classmates and periodically come across a response from the api:
"Exception caught: Empty post id"
At the same time, the post 50\50 goes to the feed.
Request example:
\\u0430 \\u0434\\u0438\\u0437\\u0430\\u0439\\u043d\\u0435\\u0440\\u0441\\u043a\\u0438\\u0435 \\u0432\\u0435\\u0449\\ u0438 \\u0438\\u0437 \\u0445\\u043e\\u0440\\u043e\\u0448\\u0438\\u0445 \\u043c\\u0430\\u0433\\u0430\\u0437\\u0438\\u043d\ \u043e\\u0432. \\u0410\\u0436 \\u0437\\u0430\\u0432\\u0438\\u0441\\u0442\\u044c \\u0431\\u0435\\u0440\\u0435\\u0442! \\n\\u0417\\u0410\\u0414\\u0410\\u0427\\u0410: \\u043a\\u0430\\u043a \\u0442\\u0430\\u043a \\u043f\\u043e\\u043b\ \u0443\\u0447\\u0430\\u0435\\u0442\\u0441\\u044f?\\n\\u0410 \\u041e\\u0422\\u0412\\u0415\\u0422 \\u041f\\u0420\\ u041e\\u0421\\u0422\\u041e\\u0419: \\u041d\\u0443\\u0436\\u043d\\u043e \\u043f\\u0440\\u043e\\u0441\\u0442\\u043e \\u0437 \\u043d\\u0430\\u0442\\u044c, \\u0433\\u0434\\u0435 \\u043f\\u043e\\u043a\\u0443\\u043f\\u0430\\u0442\\u044c \\u0438 \\u043a\\u0430\\u043a \\u043f\\ u043e\\u043a\\u0443\\u043f\\u0430\\u0442\\u044c! \\u041f\\u043e\\u0434\\u0440\\u0443\\u0433\\u0430 \\u0441\\u043a\\u0438\\u043d\\u0443\\u043b\\u0430 \\u043c\\u043d\\ u0435 \\u0441\\u0441\\u044b\\u043b\\u043a\\u0443 \\u043d\\u0430 \\u044d\\u0442\\u0443 \\u0433\\u0440\\u0443\\u043f\\u043f\ \u0443 http:\\/\\/buzzok.ru\\/aguscw \\u0412\\u0441\\u0442\\u0443\\u043f\\u0438\\u0442\\u044c - \\u044d\\u0442\\ u043e \\u041e\\u0414\\u0418\\u041d \\u041a\\u041b\\u0418\\u041a, \\u0437\\u0430\\u0442\\u043e \\u043c\\u043e\\u0436\\u043d\\u043e \\u0443\\u0437\\u043d\\u0430\\u0442\\u044c \\u043e \\ u043b\\u0443\\u0447\\u0448\\u0438\\u0445 \\u0441\\u043a\\u0438\\u0434\\u043a\\u0430\\u0445 \\u0432 \\u0438\\u043d\\u0442\ \u0435\\u0440\\u043d\\u0435\\u0442-\\u043c\\u0430\\u0433\\u0430\\u0437\\u0438\\u043d\\u0430\\u0445! \\u0410 \\u0433\\u043b\\u0430\\u0432\\u043d\\u043e\\u0435, \\u0447\\u0442\\u043e PayPal \\u0440\\u0430\\u0431\\u043e\\u0442 \\u0430\\u0435\\u0442 \\u0441 \\u043f\\u0440\\u043e\\u0432\\u0435\\u0440\\u0435\\u043d\\u043d\\u044b\\u043c\\u0438 \\ u043c\\u0430\\u0433\\u0430\\u0437\\u0438\\u043d\\u0430\\u043c\\u0438, \\u0437\\u043d\\u0430\\u0447\\u0438\\u0442 \\u043d \\u0438\\u043a\\u0442\\u043e \\u043d\\u0435 \\u043e\\u0431\\u043c\\u0430\\u043d\\u0435\\u0442! \\u041f\\u0440\\u043e\\u0441\\u0442\\u043e,