Hi @houaida_youssef and welcome to the community.
To fix the issue, you have to set the hash_key_function in your gateway config file to any of the possible values: murmur64, murmur128, sha256. Be aware that the higher the hashing algorithm, the slower the performance.
Also, set the hash_key_function_fallback value to be an array with an empty string as the only element.
In summary:
"hash_key_function": "murmur64",
"hash_key_function_fallback": [""]
Hope this helps.