Log error: "client public ip: JSON length 0 out of range"

Hi everyone,

I've noticed an issue in my application logs where the following message appears occasionally, but not consistently:
client public ip: JSON length 0 out of range

What's confusing is that this error doesn't happen all the time--it only shows up intermittently.
Has anyone experienced something similar or knows what might cause this?

Could it be related to empty or malformed JSON responses, or perhaps a timing/network issue?
Any ideas on what might trigger this and how to debug or prevent it would be greatly appreciated.
Thanks in advance!