diff --git a/build.gradle b/build.gradle
index bea5027..07bcf93 100644
--- a/build.gradle
+++ b/build.gradle
@@ -59,7 +59,7 @@ dependencies {
     implementation("me.shedaniel:linkie-core:1.0.92") {
         exclude module: "korio"
     }
-    discord_apiImplementation("com.github.Discord4J.Discord4J:discord4j-core:c25f7e1") {
+    discord_apiImplementation("com.github.Discord4J.Discord4J:discord4j-core:c8b1738") {
         force = true
     }
 //    compile("com.github.shadorc.discord4j:discord4j-core:217336e") {
diff --git a/src/main/kotlin/me/shedaniel/linkie/discord/LinkieBot.kt b/src/main/kotlin/me/shedaniel/linkie/discord/LinkieBot.kt
index b58f58a..b857b4c 100644
--- a/src/main/kotlin/me/shedaniel/linkie/discord/LinkieBot.kt
+++ b/src/main/kotlin/me/shedaniel/linkie/discord/LinkieBot.kt
@@ -209,7 +209,7 @@ fun registerCommands(commands: CommandManager) {
     commands.registerCommand(false, QueryMappingsCommand(null, MappingsEntryType.METHOD), "m", "method")
     commands.registerCommand(false, QueryMappingsCommand(null, MappingsEntryType.FIELD), "f", "field")
 
-    commands.registerCommand(false, QueryMappingsCommand(Namespaces["yarn"], *MappingsEntryType.values()), "y", "yarn")
+    commands.registerCommand(QueryMappingsCommand(Namespaces["yarn"], *MappingsEntryType.values()), listOf("y", "yarn"), listOf("yarn"))
     commands.registerCommand(false, QueryMappingsCommand(Namespaces["yarn"], MappingsEntryType.CLASS), "yc", "yarnc")
     commands.registerCommand(false, QueryMappingsCommand(Namespaces["yarn"], MappingsEntryType.METHOD), "ym", "yarnm")
     commands.registerCommand(false, QueryMappingsCommand(Namespaces["yarn"], MappingsEntryType.FIELD), "yf", "yarnf")
@@ -224,7 +224,7 @@ fun registerCommands(commands: CommandManager) {
     commands.registerCommand(false, QueryMappingsCommand(Namespaces["yarrn"], MappingsEntryType.METHOD), "yrm", "yarrnm")
     commands.registerCommand(false, QueryMappingsCommand(Namespaces["yarrn"], MappingsEntryType.FIELD), "yrf", "yarnrf")
 
-    commands.registerCommand(false, QueryMappingsCommand(Namespaces["mcp"], *MappingsEntryType.values()), "mcp")
+    commands.registerCommand(QueryMappingsCommand(Namespaces["mcp"], *MappingsEntryType.values()), "mcp")
     commands.registerCommand(false, QueryMappingsCommand(Namespaces["mcp"], MappingsEntryType.CLASS), "mcpc")
     commands.registerCommand(false, QueryMappingsCommand(Namespaces["mcp"], MappingsEntryType.METHOD), "mcpm")
     commands.registerCommand(false, QueryMappingsCommand(Namespaces["mcp"], MappingsEntryType.FIELD), "mcpf")
@@ -236,12 +236,12 @@ fun registerCommands(commands: CommandManager) {
     commands.registerCommand(false, QueryMappingsCommand(Namespaces["plasma"], MappingsEntryType.METHOD), "plasmam", "plm")
     commands.registerCommand(false, QueryMappingsCommand(Namespaces["plasma"], MappingsEntryType.FIELD), "plasmaf", "plf")
 
-    commands.registerCommand(false, QueryMappingsCommand(Namespaces["mojang"], *MappingsEntryType.values()), "mmi", "mojmapi")
+    commands.registerCommand(QueryMappingsCommand(Namespaces["mojang"], *MappingsEntryType.values()), listOf("mmi", "mojmapi"), listOf("mmi"))
     commands.registerCommand(false, QueryMappingsCommand(Namespaces["mojang"], MappingsEntryType.CLASS), "mmic", "mojmapic")
     commands.registerCommand(false, QueryMappingsCommand(Namespaces["mojang"], MappingsEntryType.METHOD), "mmim", "mojmapim")
     commands.registerCommand(false, QueryMappingsCommand(Namespaces["mojang"], MappingsEntryType.FIELD), "mmif", "mojmapim")
 
-    commands.registerCommand(false, QueryMappingsCommand(Namespaces["mojang_srg"], *MappingsEntryType.values()), "mms", "mojmaps")
+    commands.registerCommand(QueryMappingsCommand(Namespaces["mojang_srg"], *MappingsEntryType.values()), listOf("mms", "mojmaps"), listOf("mms"))
     commands.registerCommand(false, QueryMappingsCommand(Namespaces["mojang_srg"], MappingsEntryType.CLASS), "mmsc", "mojmapsc")
     commands.registerCommand(false, QueryMappingsCommand(Namespaces["mojang_srg"], MappingsEntryType.METHOD), "mmsm", "mojmapsm")
     commands.registerCommand(false, QueryMappingsCommand(Namespaces["mojang_srg"], MappingsEntryType.FIELD), "mmsf", "mojmapsm")
diff --git a/src/main/kotlin/me/shedaniel/linkie/discord/commands/QueryMappingsCommand.kt b/src/main/kotlin/me/shedaniel/linkie/discord/commands/QueryMappingsCommand.kt
index 8d94372..ad503b0 100644
--- a/src/main/kotlin/me/shedaniel/linkie/discord/commands/QueryMappingsCommand.kt
+++ b/src/main/kotlin/me/shedaniel/linkie/discord/commands/QueryMappingsCommand.kt
@@ -63,10 +63,14 @@ open class QueryMappingsCommand(
 ) : Command {
     override suspend fun SlashCommandBuilderInterface.buildCommand(slash: Boolean) {
         if (slash) {
-            (sequenceOf("all") + MappingsEntryType.values().asSequence().map { it.name.toLowerCase() }).forEach { type ->
-                subGroup(type, "Queries mappings for the '$type' type") {
-                    buildNamespaces(slash, if (type == "all") MappingsEntryType.values() else arrayOf(MappingsEntryType.valueOf(type.toUpperCase())))
+            if (namespace == null) {
+                (sequenceOf("all") + MappingsEntryType.values().asSequence().map { it.name.toLowerCase() }).forEach { type ->
+                    subGroup(type, "Queries mappings for the '$type' type") {
+                        buildNamespaces(slash, if (type == "all") MappingsEntryType.values() else arrayOf(MappingsEntryType.valueOf(type.toUpperCase())))
+                    }
                 }
+            } else {
+                buildNamespaces(false, types)
             }
         } else {
             buildNamespaces(slash, types)
diff --git a/src/main/kotlin/me/shedaniel/linkie/discord/commands/RunTrickCommand.kt b/src/main/kotlin/me/shedaniel/linkie/discord/commands/RunTrickCommand.kt
index 3bc4dbf..ca92849 100644
--- a/src/main/kotlin/me/shedaniel/linkie/discord/commands/RunTrickCommand.kt
+++ b/src/main/kotlin/me/shedaniel/linkie/discord/commands/RunTrickCommand.kt
@@ -20,6 +20,7 @@ import me.shedaniel.linkie.discord.Command
 import me.shedaniel.linkie.discord.scommands.SlashCommandBuilderInterface
 import me.shedaniel.linkie.discord.scommands.args
 import me.shedaniel.linkie.discord.scommands.opt
+import me.shedaniel.linkie.discord.scommands.optNullable
 import me.shedaniel.linkie.discord.scommands.string
 import me.shedaniel.linkie.discord.scripting.ContextExtensions
 import me.shedaniel.linkie.discord.scripting.EvalContext
@@ -33,7 +34,7 @@ object RunTrickCommand : Command {
     override suspend fun SlashCommandBuilderInterface.buildCommand(slash: Boolean) {
         val trickName = string("trick_name", "Name of the trick")
         val args = args(required = false)
-        executeCommandWithGetter { ctx, options -> execute(ctx, options.opt(trickName), options.opt(args)) }
+        executeCommandWithGetter { ctx, options -> execute(ctx, options.opt(trickName), options.optNullable(args) ?: mutableListOf()) }
     }
 
     suspend fun execute(ctx: CommandContext, trickName: String, args: MutableList<String>) {