diff --git a/packages/client/lib/client/commands-queue.ts b/packages/client/lib/client/commands-queue.ts
index 84ec7e52c9..df2c25dbc2 100644
--- a/packages/client/lib/client/commands-queue.ts
+++ b/packages/client/lib/client/commands-queue.ts
@@ -26,7 +26,7 @@ interface CommandWaitingToBeSent extends CommandWaitingForReply {
 
 interface CommandWaitingForReply {
     resolve(reply?: unknown): void;
-    reject(err: Error): void;
+    reject(err: unknown): void;
     channelsCounter?: number;
     returnBuffers?: boolean;
 }
@@ -142,7 +142,9 @@ export default class RedisCommandsQueue {
         },
         returnError: (err: Error) => this.#shiftWaitingForReply().reject(err)
     });
+
     #chainInExecution: symbol | undefined;
+
     constructor(maxLength: number | null | undefined) {
         this.#maxLength = maxLength;
     }
@@ -155,6 +157,7 @@ export default class RedisCommandsQueue {
         } else if (options?.signal?.aborted) {
             return Promise.reject(new AbortError());
         }
+
         return new Promise((resolve, reject) => {
             const node = new LinkedList.Node<CommandWaitingToBeSent>({
                 args,
@@ -178,6 +181,7 @@ export default class RedisCommandsQueue {
                     once: true
                 });
             }
+
             if (options?.asap) {
                 this.#waitingToBeSent.unshiftNode(node);
             } else {
@@ -386,12 +390,13 @@ export default class RedisCommandsQueue {
 
     flushWaitingForReply(err: Error): void {
         RedisCommandsQueue.#flushQueue(this.#waitingForReply, err);
-        if (!this.#chainInExecution) {
-            return;
-        }
+
+        if (!this.#chainInExecution) return;
+
         while (this.#waitingToBeSent.head?.value.chainId === this.#chainInExecution) {
             this.#waitingToBeSent.shift();
         }
+
         this.#chainInExecution = undefined;
     }
 
diff --git a/packages/client/lib/client/index.spec.ts b/packages/client/lib/client/index.spec.ts
index c5bfb32c03..1d627756c6 100644
--- a/packages/client/lib/client/index.spec.ts
+++ b/packages/client/lib/client/index.spec.ts
@@ -1,6 +1,6 @@
 import { strict as assert } from 'assert';
 import testUtils, { GLOBAL, waitTillBeenCalled } from '../test-utils';
-import RedisClient, { ClientLegacyCommandArguments, RedisClientType } from '.';
+import RedisClient, { RedisClientType } from '.';
 import { RedisClientMultiCommandType } from './multi-command';
 import { RedisCommandArguments, RedisCommandRawReply, RedisModules, RedisScripts } from '../commands';
 import { AbortError, AuthError, ClientClosedError, ConnectionTimeoutError, DisconnectsClientError, SocketClosedUnexpectedlyError, WatchError } from '../errors';
@@ -183,7 +183,7 @@ describe('Client', () => {
             }
         });
 
-        function setAsync<M extends RedisModules, S extends RedisScripts>(client: RedisClientType<M, S>, ...args: ClientLegacyCommandArguments): Promise<RedisCommandRawReply> {
+        function setAsync<M extends RedisModules, S extends RedisScripts>(client: RedisClientType<M, S>, ...args: Array<any>): Promise<RedisCommandRawReply> {
             return new Promise((resolve, reject) => {
                 (client as any).set(...args, (err: Error | undefined, reply: RedisCommandRawReply) => {
                     if (err) return reject(err);
@@ -353,6 +353,18 @@ describe('Client', () => {
                 );
             }, GLOBAL.SERVERS.OPEN);
         });
+
+        testUtils.testWithClient('undefined and null should not break the client', async client => {
+            await assert.rejects(
+                client.sendCommand([null as any, undefined as any]),
+                'ERR unknown command ``, with args beginning with: ``'
+            );
+
+            assert.equal(
+                await client.ping(),
+                'PONG'
+            );
+        }, GLOBAL.SERVERS.OPEN);
     });
 
     describe('multi', () => {
diff --git a/packages/client/lib/client/index.ts b/packages/client/lib/client/index.ts
index 6144c98070..80f029a406 100644
--- a/packages/client/lib/client/index.ts
+++ b/packages/client/lib/client/index.ts
@@ -9,7 +9,7 @@ import { CommandOptions, commandOptions, isCommandOptions } from '../command-opt
 import { ScanOptions, ZMember } from '../commands/generic-transformers';
 import { ScanCommandOptions } from '../commands/SCAN';
 import { HScanTuple } from '../commands/HSCAN';
-import { extendWithCommands, extendWithModulesAndScripts, LegacyCommandArguments, transformCommandArguments, transformCommandReply, transformLegacyCommandArguments } from '../commander';
+import { extendWithCommands, extendWithModulesAndScripts, transformCommandArguments, transformCommandReply } from '../commander';
 import { Pool, Options as PoolOptions, createPool } from 'generic-pool';
 import { ClientClosedError, DisconnectsClientError, AuthError } from '../errors';
 import { URL } from 'url';
@@ -83,7 +83,6 @@ export interface ClientCommandOptions extends QueueCommandOptions {
 
 type ClientLegacyCallback = (err: Error | null, reply?: RedisCommandRawReply) => void;
 
-export type ClientLegacyCommandArguments = LegacyCommandArguments | [...LegacyCommandArguments, ClientLegacyCallback];
 export default class RedisClient<M extends RedisModules, S extends RedisScripts> extends EventEmitter {
     static commandOptions<T extends ClientCommandOptions>(options: T): CommandOptions<T> {
         return commandOptions(options);
@@ -292,13 +291,13 @@ export default class RedisClient<M extends RedisModules, S extends RedisScripts>
         if (!this.#options?.legacyMode) return;
 
         (this as any).#v4.sendCommand = this.#sendCommand.bind(this);
-        (this as any).sendCommand = (...args: ClientLegacyCommandArguments): void => {
+        (this as any).sendCommand = (...args: Array<any>): void => {
             let callback: ClientLegacyCallback;
             if (typeof args[args.length - 1] === 'function') {
                 callback = args.pop() as ClientLegacyCallback;
             }
 
-            this.#sendCommand(transformLegacyCommandArguments(args as LegacyCommandArguments))
+            this.#sendCommand(args.flat())
                 .then((reply: RedisCommandRawReply) => {
                     if (!callback) return;
 
diff --git a/packages/client/lib/client/multi-command.ts b/packages/client/lib/client/multi-command.ts
index 601334fe6d..cce0b515f1 100644
--- a/packages/client/lib/client/multi-command.ts
+++ b/packages/client/lib/client/multi-command.ts
@@ -1,7 +1,7 @@
 import COMMANDS from './commands';
 import { RedisCommand, RedisCommandArguments, RedisCommandRawReply, RedisModules, RedisPlugins, RedisScript, RedisScripts } from '../commands';
 import RedisMultiCommand, { RedisMultiQueuedCommand } from '../multi-command';
-import { extendWithCommands, extendWithModulesAndScripts, LegacyCommandArguments, transformLegacyCommandArguments } from '../commander';
+import { extendWithCommands, extendWithModulesAndScripts } from '../commander';
 import { ExcludeMappedString } from '.';
 
 type RedisClientMultiCommandSignature<C extends RedisCommand, M extends RedisModules, S extends RedisScripts> =
@@ -53,8 +53,8 @@ export default class RedisClientMultiCommand {
 
     #legacyMode(): void {
         this.v4.addCommand = this.addCommand.bind(this);
-        (this as any).addCommand = (...args: LegacyCommandArguments): this => {
-            this.#multi.addCommand(transformLegacyCommandArguments(args));
+        (this as any).addCommand = (...args: Array<any>): this => {
+            this.#multi.addCommand(args.flat());
             return this;
         };
         this.v4.exec = this.exec.bind(this);
diff --git a/packages/client/lib/client/socket.ts b/packages/client/lib/client/socket.ts
index ccbe3f7f2c..d7b91e14c0 100644
--- a/packages/client/lib/client/socket.ts
+++ b/packages/client/lib/client/socket.ts
@@ -249,18 +249,16 @@ export default class RedisSocket extends EventEmitter {
     #isCorked = false;
 
     cork(): void {
-        if (!this.#socket) {
+        if (!this.#socket || this.#isCorked) {
             return;
         }
 
-        if (!this.#isCorked) {
-            this.#socket.cork();
-            this.#isCorked = true;
+        this.#socket.cork();
+        this.#isCorked = true;
 
-            queueMicrotask(() => {
-                this.#socket?.uncork();
-                this.#isCorked = false;
-            });
-        }
+        queueMicrotask(() => {
+            this.#socket?.uncork();
+            this.#isCorked = false;
+        });
     }
 }
diff --git a/packages/client/lib/commander.spec.ts b/packages/client/lib/commander.spec.ts
index b6ec100461..f0690f3736 100644
--- a/packages/client/lib/commander.spec.ts
+++ b/packages/client/lib/commander.spec.ts
@@ -2,42 +2,34 @@ import { strict as assert } from 'assert';
 import { describe } from 'mocha';
 import { encodeCommand } from './commander';
 
-function encodeCommandToString(...args: Parameters<typeof encodeCommand>): string {
-    const arr = [];
-    for (const item of encodeCommand(...args)) {
-        arr.push(item.toString());
-    }
-
-    return arr.join('');
-}
 
 describe('Commander', () => {
     describe('encodeCommand (see #1628)', () => {
         it('1 byte', () => {
-            assert.equal(
-                encodeCommandToString(['a', 'z']),
-                '*2\r\n$1\r\na\r\n$1\r\nz\r\n'
+            assert.deepEqual(
+                [...encodeCommand(['a', 'z'])],
+                ['*2\r\n$1\r\na\r\n$1\r\nz\r\n']
             );
         });
 
         it('2 bytes', () => {
-            assert.equal(
-                encodeCommandToString(['א', 'ת']),
-                '*2\r\n$2\r\nא\r\n$2\r\nת\r\n'
+            assert.deepEqual(
+                [...encodeCommand(['א', 'ת'])],
+                ['*2\r\n$2\r\nא\r\n$2\r\nת\r\n']
             );
         });
 
         it('4 bytes', () => {
-            assert.equal(
-                encodeCommandToString(['🐣', '🐤']),
-                '*2\r\n$4\r\n🐣\r\n$4\r\n🐤\r\n'
+            assert.deepEqual(
+                [...encodeCommand(['🐣', '🐤'])],
+                ['*2\r\n$4\r\n🐣\r\n$4\r\n🐤\r\n']
             );
         });
 
         it('with a buffer', () => {
-            assert.equal(
-                encodeCommandToString([Buffer.from('string')]),
-                '*1\r\n$6\r\nstring\r\n'
+            assert.deepEqual(
+                [...encodeCommand([Buffer.from('string')])],
+                ['*1\r\n$6\r\n', Buffer.from('string'), '\r\n']
             );
         });
     });
diff --git a/packages/client/lib/commander.ts b/packages/client/lib/commander.ts
index 2d129d679e..b3dfff0a99 100644
--- a/packages/client/lib/commander.ts
+++ b/packages/client/lib/commander.ts
@@ -95,25 +95,25 @@ export function* encodeCommand(args: RedisCommandArguments): IterableIterator<Re
     let strings = `*${args.length}${DELIMITER}`,
         stringsLength = 0;
     for (const arg of args) {
-        const isString = typeof arg === 'string',
-            byteLength = isString ? Buffer.byteLength(arg): arg.length;
-        strings += `$${byteLength}${DELIMITER}`;
-
-        if (isString) {
-            const totalLength = stringsLength + byteLength;
-            if (totalLength > 1024) {
-                yield strings;
-                strings = arg;
-                stringsLength = byteLength;
-            } else {
-                strings += arg;
-                stringsLength = totalLength;
-            }
-        } else {
-            yield strings;
+        if (Buffer.isBuffer(arg)) {
+            yield `${strings}$${arg.length}${DELIMITER}`;
             strings = '';
             stringsLength = 0;
             yield arg;
+        } else {
+            const string = arg?.toString?.() ?? '',
+                byteLength = Buffer.byteLength(string);
+            strings += `$${byteLength}${DELIMITER}`;
+
+            const totalLength = stringsLength + byteLength;
+            if (totalLength > 1024) {
+                yield strings;
+                strings = string;
+                stringsLength = byteLength;
+            } else {
+                strings += string;
+                stringsLength = totalLength;
+            }
         }
 
         strings += DELIMITER;
@@ -133,18 +133,3 @@ export function transformCommandReply(
 
     return command.transformReply(rawReply, preserved);
 }
-
-export type LegacyCommandArguments = Array<string | number | Buffer | LegacyCommandArguments>;
-
-export function transformLegacyCommandArguments(args: LegacyCommandArguments, flat: RedisCommandArguments = []): RedisCommandArguments {
-    for (const arg of args) {
-        if (Array.isArray(arg)) {
-            transformLegacyCommandArguments(arg, flat);
-            continue;
-        }
-
-        flat.push(typeof arg === 'number' ? arg.toString() : arg);
-    }
-
-    return flat;
-}