diff --git a/migrations/committed/000014-allow-null-gender.sql b/migrations/committed/000014-allow-null-gender.sql
new file mode 100644
index 0000000..bd0e3bb
--- /dev/null
+++ b/migrations/committed/000014-allow-null-gender.sql
@@ -0,0 +1,8 @@
+--! Previous: sha1:e7ff9a64813ea9e0a701219f6b2ba8ed88dcf240
+--! Hash: sha1:2a39b3b006a8d5ec5d30ac1e5c2158d282b99acb
+--! Message: allow null gender
+
+ALTER TABLE Player
+    ALTER COLUMN GenderId DROP NOT NULL;
+ALTER FUNCTION Command_Join(varchar, varchar, varchar, varchar, varchar, varchar, varchar) CALLED ON NULL INPUT;
+ALTER FUNCTION UpdatePlayerRegistration(varchar, varchar, varchar, varchar, varchar) CALLED ON NULL INPUT;
diff --git a/src/commands/game/JoinCommand.ts b/src/commands/game/JoinCommand.ts
index ee541e9..499a1a4 100644
--- a/src/commands/game/JoinCommand.ts
+++ b/src/commands/game/JoinCommand.ts
@@ -15,7 +15,7 @@ export class JoinCommand extends SlashCommand {
         super(creator, {
             name: "join",
             guildIDs: gameGuildIds,
-            description: "Allows a new player to join the game.",
+            description: "Allows a new player to join the game or an existing player to update their registration.",
             options: [
                 {
                     name: "name",
@@ -28,10 +28,13 @@ export class JoinCommand extends SlashCommand {
                     description: "Your gender for the purposes of this game. Purely cosmetic. You can change it at any time.",
                     required: true,
                     type: CommandOptionType.STRING,
-                    choices: genders.map((item) => ({
+                    choices: [...genders.map((item) => ({
                         name: item.name,
                         value: item.id,
-                    })),
+                    })), {
+                        name: "NULL",
+                        value: "NULL",
+                    }],
                 }
             ]
         });
@@ -41,10 +44,10 @@ export class JoinCommand extends SlashCommand {
 
     async run(ctx: CommandContext): Promise<void> {
         const name = ctx.options.name ?? "Anonymous"
-        const gender = ctx.options.gender ?? "nb"
+        const gender = ctx.options.gender === "NULL" ? null : (ctx.options.gender ?? "nb")
         try {
             const result =
-                singleRowQueryResult(await this.pool.query<{ resultid: number, newplayername: string, newgendername: string, wascreated: boolean }>({
+                singleRowQueryResult(await this.pool.query<{ resultid: number, newplayername: string, newgendername: string | null, wascreated: boolean }>({
                     text: `SELECT resultId, newPlayerName, newGenderName, wasCreated
                            FROM Command_Join($1, $2, $3, $4, $5, $6, $7)`,
                     values: [
@@ -60,12 +63,12 @@ export class JoinCommand extends SlashCommand {
                 console.log("Unexpectedly empty Command_Join result!")
             } else if (result.wascreated) {
                 await ctx.send({
-                    content: `You got it! Welcome aboard, ${result.newplayername}! I have you down in my records as ${result.newgendername}. If you ever want to change your name or gender, just /join again!`,
+                    content: `You got it! Welcome aboard, ${result.newplayername}! I have you down in my records as ${result.newgendername ?? `\`NULL\``}. If you ever want to change your name or gender, just /join again!`,
                     ephemeral: true,
                 })
             } else {
                 await ctx.send({
-                    content: `Duly noted! I've updated your deets to have you down as ${result.newplayername}, who is ${result.newgendername}. If you ever want to change your name or gender, just /join again!`,
+                    content: `Duly noted! I've updated your deets to have you down as ${result.newplayername}, who is ${result.newgendername ?? `\`NULL\``}. If you ever want to change your name or gender, just /join again!`,
                     ephemeral: true,
                 })
             }