diff --git a/tgbotapi.api/api/tgbotapi.api.api b/tgbotapi.api/api/tgbotapi.api.api
index 60472c9b43..f98641dffa 100644
--- a/tgbotapi.api/api/tgbotapi.api.api
+++ b/tgbotapi.api/api/tgbotapi.api.api
@@ -403,7 +403,8 @@ public final class dev/inmo/tgbotapi/extensions/api/business/SetBusinessAccountU
 }
 
 public final class dev/inmo/tgbotapi/extensions/api/business/SetBusinessAccountUsernameKt {
-	public static final fun setBusinessAccountUsername-_dB6Ko0 (Ldev/inmo/tgbotapi/bot/RequestsExecutor;Ljava/lang/String;Ljava/lang/String;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
+	public static final fun setBusinessAccountUsername-aYbkVkY (Ldev/inmo/tgbotapi/bot/RequestsExecutor;Ljava/lang/String;Ljava/lang/String;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
+	public static synthetic fun setBusinessAccountUsername-aYbkVkY$default (Ldev/inmo/tgbotapi/bot/RequestsExecutor;Ljava/lang/String;Ljava/lang/String;Lkotlin/coroutines/Continuation;ILjava/lang/Object;)Ljava/lang/Object;
 }
 
 public final class dev/inmo/tgbotapi/extensions/api/business/TransferBusinessAccountStarBalanceKt {
diff --git a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/business/SetBusinessAccountUsername.kt b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/business/SetBusinessAccountUsername.kt
index 4fa31332fa..0982a5301c 100644
--- a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/business/SetBusinessAccountUsername.kt
+++ b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/business/SetBusinessAccountUsername.kt
@@ -7,11 +7,9 @@ import dev.inmo.tgbotapi.requests.business_connection.SetBusinessAccountUsername
 import dev.inmo.tgbotapi.types.business_connection.BusinessConnectionId
 import dev.inmo.tgbotapi.types.Username
 
-@GenerateVariations
 public suspend fun TelegramBot.setBusinessAccountUsername(
     businessConnectionId: BusinessConnectionId,
-    @GenerationVariant(String::class, "Username(username)", "username")
-    username: Username
+    username: Username? = null
 ): Unit = execute(
     SetBusinessAccountUsername(businessConnectionId, username)
 ) 
\ No newline at end of file
diff --git a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/business/SetBusinessAccountUsernameGeneratedVariation.kt b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/business/SetBusinessAccountUsernameGeneratedVariation.kt
index b13407ca97..72a9a525d2 100644
--- a/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/business/SetBusinessAccountUsernameGeneratedVariation.kt
+++ b/tgbotapi.api/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/api/business/SetBusinessAccountUsernameGeneratedVariation.kt
@@ -9,8 +9,10 @@ import dev.inmo.tgbotapi.types.business_connection.BusinessConnectionId
 import kotlin.Boolean
 import kotlin.String
 
-public suspend
-    fun TelegramBot.setBusinessAccountUsername(businessConnectionId: BusinessConnectionId,
-    username: String): Unit = setBusinessAccountUsername(
-    businessConnectionId = businessConnectionId, username = with(username) { Username.prepare(username) }
+public suspend fun TelegramBot.setBusinessAccountUsername(
+    businessConnectionId: BusinessConnectionId,
+    username: String?
+): Unit = setBusinessAccountUsername(
+    businessConnectionId = businessConnectionId,
+    username = username ?.let { Username.prepare(username) }
 )
diff --git a/tgbotapi.core/api/tgbotapi.core.api b/tgbotapi.core/api/tgbotapi.core.api
index 7fec1f3e22..03544333c7 100644
--- a/tgbotapi.core/api/tgbotapi.core.api
+++ b/tgbotapi.core/api/tgbotapi.core.api
@@ -2424,17 +2424,18 @@ public final class dev/inmo/tgbotapi/requests/business_connection/SetBusinessAcc
 
 public final class dev/inmo/tgbotapi/requests/business_connection/SetBusinessAccountUsername : dev/inmo/tgbotapi/requests/abstracts/BusinessRequest$Simple {
 	public static final field Companion Ldev/inmo/tgbotapi/requests/business_connection/SetBusinessAccountUsername$Companion;
+	public synthetic fun <init> (Ljava/lang/String;Ljava/lang/String;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
 	public synthetic fun <init> (Ljava/lang/String;Ljava/lang/String;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
 	public final fun component1-T-_HSQI ()Ljava/lang/String;
-	public final fun component2-xonw-vc ()Ljava/lang/String;
-	public final fun copy-PzCSSl4 (Ljava/lang/String;Ljava/lang/String;)Ldev/inmo/tgbotapi/requests/business_connection/SetBusinessAccountUsername;
-	public static synthetic fun copy-PzCSSl4$default (Ldev/inmo/tgbotapi/requests/business_connection/SetBusinessAccountUsername;Ljava/lang/String;Ljava/lang/String;ILjava/lang/Object;)Ldev/inmo/tgbotapi/requests/business_connection/SetBusinessAccountUsername;
+	public final fun component2-san03mo ()Ljava/lang/String;
+	public final fun copy-K73sskI (Ljava/lang/String;Ljava/lang/String;)Ldev/inmo/tgbotapi/requests/business_connection/SetBusinessAccountUsername;
+	public static synthetic fun copy-K73sskI$default (Ldev/inmo/tgbotapi/requests/business_connection/SetBusinessAccountUsername;Ljava/lang/String;Ljava/lang/String;ILjava/lang/Object;)Ldev/inmo/tgbotapi/requests/business_connection/SetBusinessAccountUsername;
 	public fun equals (Ljava/lang/Object;)Z
 	public fun getBusinessConnectionId-T-_HSQI ()Ljava/lang/String;
 	public synthetic fun getBusinessConnectionId-nXr5wdE ()Ljava/lang/String;
 	public fun getRequestSerializer ()Lkotlinx/serialization/SerializationStrategy;
 	public fun getResultDeserializer ()Lkotlinx/serialization/DeserializationStrategy;
-	public final fun getUsername-xonw-vc ()Ljava/lang/String;
+	public final fun getUsername-san03mo ()Ljava/lang/String;
 	public fun hashCode ()I
 	public fun method ()Ljava/lang/String;
 	public fun toString ()Ljava/lang/String;
diff --git a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/business_connection/SetBusinessAccountUsername.kt b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/business_connection/SetBusinessAccountUsername.kt
index ab242dc7f4..c012ee1db1 100644
--- a/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/business_connection/SetBusinessAccountUsername.kt
+++ b/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/business_connection/SetBusinessAccountUsername.kt
@@ -27,7 +27,7 @@ data class SetBusinessAccountUsername(
     override val businessConnectionId: BusinessConnectionId,
     @SerialName(usernameField)
     @Serializable(Username.Companion.WithoutAtSerializer::class)
-    val username: Username
+    val username: Username? = null
 ) : BusinessRequest.Simple<Unit> {
     override fun method(): String = "setBusinessAccountUsername"