QiangYoung opened DATAREDIS-1214 and commented
In redis, the geodist command may return a null value. which also mentioned in the comments of "io.lettuce.core.api.sync.RedisGeoCommands#geodist".
But in "org.springframework.data.redis.connection.lettuce.LettuceGeoCommands#geoDist", the distanceConverter accepts a non-null Double parameter and convert to "org.springframework.data.geo.Distance".
Referenced from: pull request #565
Backported to: 2.3.5 (Neumann SR5), 2.2.11 (Moore SR11)