error="saml_token_not_found"

I’m using Keycloak as an IDP for my own application. The redirection between my application and Keycloak happens normally and the return redirection from Keycloak to my application also seems to be correct, but Keycloak returns the following error message:

WARN [org.keycloak.events] (executor-thread-227) type=“LOGIN_ERROR”, realmId=“3ad541b2-46ab-44d4-9203-f7d081f0e58f”, realmName=“647”, clientId=“null”, userId=" null", ipAddress=“172.17.0.1”, error=“saml_token_not_found”

Could anyone tell me if Keycloak identified an error when redirecting my application?