Unknown target reason on murmur head

[Miniluchi]

Hi, i have this error multiple time :

[10Mar2024 18:19:14.684] [Server thread/WARN] [Minecraft/]: Unknown target reason, please report on the issue tracker
java.lang.Exception: null
    at net.minecraft.world.entity.Mob.setTarget(Mob.java:258) ~[server-1.20.1-20230612.114412-srg.jar%23127!/:?]
    at net.minecraft.world.entity.Mob.m_6710_(Mob.java:248) ~[server-1.20.1-20230612.114412-srg.jar%23127!/:?]
    at com.github.alexthe666.alexsmobs.entity.EntityMurmurHead.m_8119_(EntityMurmurHead.java:242) ~[alexsmobs-1.22.8.jar%2395!/:1.22.8]
    at net.minecraft.server.level.ServerLevel.m_8647_(ServerLevel.java:771) ~[server-1.20.1-20230612.114412-srg.jar%23127!/:?]
    at net.minecraft.world.level.Level.m_46653_(Level.java:680) ~[server-1.20.1-20230612.114412-srg.jar%23127!/:?]
    at net.minecraft.server.level.ServerLevel.m_184063_(ServerLevel.java:393) ~[server-1.20.1-20230612.114412-srg.jar%23127!/:?]
    at net.minecraft.world.level.entity.EntityTickList.m_156910_(EntityTickList.java:54) ~[server-1.20.1-20230612.114412-srg.jar%23127!/:?]
    at net.minecraft.server.level.ServerLevel.m_8793_(ServerLevel.java:373) ~[server-1.20.1-20230612.114412-srg.jar%23127!/:?]
    at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:1302) ~[server-1.20.1-20230612.114412-srg.jar%23127!/:?]
    at net.minecraft.server.dedicated.DedicatedServer.m_5703_(DedicatedServer.java:400) ~[server-1.20.1-20230612.114412-srg.jar%23127!/:?]
    at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:1201) ~[server-1.20.1-20230612.114412-srg.jar%23127!/:?]
    at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:1012) ~[server-1.20.1-20230612.114412-srg.jar%23127!/:?]
    at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:285) ~[server-1.20.1-20230612.114412-srg.jar%23127!/:?]
    at java.lang.Thread.run(Thread.java:840) [?:?]

Here is the installed mods :