internal server error when executing "list" through /server/exec

[phybros]

$ curl -i -X 'POST' 'http://localhost:4567/v1/server/exec' -H 'accept: */*' -H 'key: change_me' -H 'Content-Type: application/x-www-form-urlencoded' -d 'command=list&time='

HTTP/1.1 500 Server Error
Date: Fri, 14 Jul 2023 17:29:22 GMT
Content-Type: application/json
Content-Length: 145

{
    "title": "Server Error",
    "status": 500,
    "type": "https://javalin.io/documentation#internalservererrorresponse",
    "details": {}
}%

error in the server log is

[13:29:22 WARN]: [io.javalin.Javalin] Uncaught exception
java.lang.RuntimeException: java.util.concurrent.CompletionException: java.lang.RuntimeException: An error occurred while executing command
	at io.servertap.api.v1.ServerApi.lambda$postCommand$7(ServerApi.java:663) ~[ServerTap.jar:?]
	at java.util.concurrent.CompletableFuture.uniExceptionally(CompletableFuture.java:990) ~[?:?]
	at java.util.concurrent.CompletableFuture$UniExceptionally.tryFire(CompletableFuture.java:974) ~[?:?]
	at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510) ~[?:?]
	at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:2194) ~[?:?]
	at io.servertap.ServerExecCommandSender.lambda$executeCommand$1(ServerExecCommandSender.java:41) ~[ServerTap.jar:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:577) ~[?:?]
	at java.util.concurrent.FutureTask.run(FutureTask.java:317) ~[?:?]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304) ~[?:?]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?]
	at java.lang.Thread.run(Thread.java:1623) ~[?:?]
Caused by: java.util.concurrent.CompletionException: java.lang.RuntimeException: An error occurred while executing command
	at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:332) ~[?:?]
	at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:347) ~[?:?]
	at java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:708) ~[?:?]
	... 9 more
Caused by: java.lang.RuntimeException: An error occurred while executing command
	... 7 more
Caused by: java.util.concurrent.ExecutionException: org.bukkit.command.CommandException: Unhandled exception executing 'list' in org.bukkit.craftbukkit.v1_19_R3.command.VanillaCommandWrapper(list)
	at org.bukkit.craftbukkit.v1_19_R3.scheduler.CraftFuture.get(CraftFuture.java:73) ~[paper-1.19.4.jar:git-Paper-508]
	at io.servertap.ServerExecCommandSender.lambda$executeCommand$1(ServerExecCommandSender.java:38) ~[ServerTap.jar:?]
	... 6 more
Caused by: org.bukkit.command.CommandException: Unhandled exception executing 'list' in org.bukkit.craftbukkit.v1_19_R3.command.VanillaCommandWrapper(list)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:165) ~[paper-api-1.19.4-R0.1-SNAPSHOT.jar:?]
	at org.bukkit.craftbukkit.v1_19_R3.CraftServer.dispatchCommand(CraftServer.java:906) ~[paper-1.19.4.jar:git-Paper-508]
	at org.bukkit.Bukkit.dispatchCommand(Bukkit.java:980) ~[paper-api-1.19.4-R0.1-SNAPSHOT.jar:?]
	at io.servertap.ServerExecCommandSender.lambda$executeCommand$0(ServerExecCommandSender.java:32) ~[ServerTap.jar:?]
	at org.bukkit.craftbukkit.v1_19_R3.scheduler.CraftFuture.run(CraftFuture.java:88) ~[paper-1.19.4.jar:git-Paper-508]
	at org.bukkit.craftbukkit.v1_19_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:483) ~[paper-1.19.4.jar:git-Paper-508]
	at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1483) ~[paper-1.19.4.jar:git-Paper-508]
	at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:447) ~[paper-1.19.4.jar:git-Paper-508]
	at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1397) ~[paper-1.19.4.jar:git-Paper-508]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1174) ~[paper-1.19.4.jar:git-Paper-508]
	at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:320) ~[paper-1.19.4.jar:git-Paper-508]
	... 1 more
Caused by: java.lang.NullPointerException: Cannot invoke "org.bukkit.command.CommandSender.hasPermission(String)" because the return value of "net.minecraft.commands.CommandListenerWrapper.getBukkitSender()" is null
	at net.minecraft.commands.Commands.lambda$new$0(Commands.java:235) ~[?:?]
	at com.mojang.brigadier.tree.CommandNode.canUse(CommandNode.java:79) ~[paper-1.19.4.jar:git-Paper-508]
	at com.mojang.brigadier.CommandDispatcher.parseNodes(CommandDispatcher.java:359) ~[paper-1.19.4.jar:?]
	at com.mojang.brigadier.CommandDispatcher.parse(CommandDispatcher.java:349) ~[paper-1.19.4.jar:?]
	at com.mojang.brigadier.CommandDispatcher.parse(CommandDispatcher.java:317) ~[paper-1.19.4.jar:?]
	at net.minecraft.commands.Commands.performPrefixedCommand(Commands.java:301) ~[?:?]
	at org.bukkit.craftbukkit.v1_19_R3.command.VanillaCommandWrapper.execute(VanillaCommandWrapper.java:45) ~[paper-1.19.4.jar:git-Paper-508]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:155) ~[paper-api-1.19.4-R0.1-SNAPSHOT.jar:?]
	at org.bukkit.craftbukkit.v1_19_R3.CraftServer.dispatchCommand(CraftServer.java:906) ~[paper-1.19.4.jar:git-Paper-508]
	at org.bukkit.Bukkit.dispatchCommand(Bukkit.java:980) ~[paper-api-1.19.4-R0.1-SNAPSHOT.jar:?]
	at io.servertap.ServerExecCommandSender.lambda$executeCommand$0(ServerExecCommandSender.java:32) ~[ServerTap.jar:?]
	at org.bukkit.craftbukkit.v1_19_R3.scheduler.CraftFuture.run(CraftFuture.java:88) ~[paper-1.19.4.jar:git-Paper-508]
	at org.bukkit.craftbukkit.v1_19_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:483) ~[paper-1.19.4.jar:git-Paper-508]
	at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1483) ~[paper-1.19.4.jar:git-Paper-508]
	at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:447) ~[paper-1.19.4.jar:git-Paper-508]
	at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1397) ~[paper-1.19.4.jar:git-Paper-508]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1174) ~[paper-1.19.4.jar:git-Paper-508]
	at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:320) ~[paper-1.19.4.jar:git-Paper-508]
	... 1 more