NullPointerException one second after being killed

I noticed this exception in the server log. It happened twice, each time one second after the death of a player. I could not reproduce the exception.

[17:12:36] [Server thread/INFO]: Toxic_Van_Ghost was impaled by Drowned
[17:12:37] [Server thread/FATAL]: Error executing task on Server
java.lang.NullPointerException: null
        at vd.b(SourceFile:208) ~[server-1.14.4.jar:?]
        at uw.a(SourceFile:897) ~[server-1.14.4.jar:?]
        at vi.a(SourceFile:475) ~[server-1.14.4.jar:?]
        at wc.a(SourceFile:835) ~[server-1.14.4.jar:?]
        at om.a(SourceFile:126) ~[server-1.14.4.jar:?]
        at om$b.a(SourceFile:18) ~[server-1.14.4.jar:?]
        at ke.a(SourceFile:21) ~[server-1.14.4.jar:?]
        at rk.run(SourceFile:18) ~[server-1.14.4.jar:?]
        at agq.h(SourceFile:144) [server-1.14.4.jar:?]
        at agu.h(SourceFile:23) [server-1.14.4.jar:?]
        at agq.q(SourceFile:118) [server-1.14.4.jar:?]
        at net.minecraft.server.MinecraftServer.aX(SourceFile:712) [server-1.14.4.jar:?]
        at net.minecraft.server.MinecraftServer.q(SourceFile:706) [server-1.14.4.jar:?]
        at agq.bh(SourceFile:103) [server-1.14.4.jar:?]
        at net.minecraft.server.MinecraftServer.p(SourceFile:690) [server-1.14.4.jar:?]
        at net.minecraft.server.MinecraftServer.run(SourceFile:646) [server-1.14.4.jar:?]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]