diff --git a/mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/QQAndroidBotNetworkHandler.kt b/mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/QQAndroidBotNetworkHandler.kt
index 3b99d7e19..2f40aad9e 100644
--- a/mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/QQAndroidBotNetworkHandler.kt
+++ b/mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/QQAndroidBotNetworkHandler.kt
@@ -11,8 +11,7 @@ import net.mamoe.mirai.qqandroid.event.PacketReceivedEvent
 import net.mamoe.mirai.qqandroid.network.protocol.packet.KnownPacketFactories
 import net.mamoe.mirai.qqandroid.network.protocol.packet.OutgoingPacket
 import net.mamoe.mirai.qqandroid.network.protocol.packet.login.LoginPacket
-import net.mamoe.mirai.qqandroid.network.protocol.packet.login.LoginPacket.LoginPacketResponse.Captcha
-import net.mamoe.mirai.qqandroid.network.protocol.packet.login.LoginPacket.LoginPacketResponse.Success
+import net.mamoe.mirai.qqandroid.network.protocol.packet.login.LoginPacket.LoginPacketResponse.*
 import net.mamoe.mirai.qqandroid.network.protocol.packet.login.SvcReqRegisterPacket
 import net.mamoe.mirai.utils.*
 import net.mamoe.mirai.utils.io.*
@@ -31,7 +30,7 @@ internal class QQAndroidBotNetworkHandler(bot: QQAndroidBot) : BotNetworkHandler
         launch(CoroutineName("Incoming Packet Receiver")) { processReceive() }
 
         bot.logger.info("Trying login")
-        when (val response = LoginPacket.SubCommand9(bot.client).sendAndExpect<LoginPacket.LoginPacketResponse>()) {
+        when (val response: LoginPacket.LoginPacketResponse = LoginPacket.SubCommand9(bot.client).sendAndExpect()) {
             is Captcha -> when (response) {
                 is Captcha.Picture -> {
                     bot.logger.info("需要图片验证码")
@@ -41,6 +40,8 @@ internal class QQAndroidBotNetworkHandler(bot: QQAndroidBot) : BotNetworkHandler
                 }
             }
 
+            is Error -> error(response.toString())
+
             is Success -> {
                 bot.logger.info("Login successful")
             }
@@ -207,10 +208,7 @@ internal class QQAndroidBotNetworkHandler(bot: QQAndroidBot) : BotNetworkHandler
     suspend fun <E : Packet> OutgoingPacket.sendAndExpect(): E {
         val handler = PacketListener(commandName = commandName, sequenceId = sequenceId)
         packetListeners.addLast(handler)
-        //println(delegate.readBytes().toUHexString())
-        println("Sending length=" + delegate.remaining)
-        channel.send(delegate)//) { packetListeners.remove(handler); "Cannot send packet" }
-        println("Packet sent")
+        channel.send(delegate)
         @Suppress("UNCHECKED_CAST")
         return handler.await() as E
     }
diff --git a/mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/protocol/packet/login/LoginPacket.kt b/mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/protocol/packet/login/LoginPacket.kt
index 02521d063..5a3a5d820 100644
--- a/mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/protocol/packet/login/LoginPacket.kt
+++ b/mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/protocol/packet/login/LoginPacket.kt
@@ -204,7 +204,7 @@ internal object LoginPacket : PacketFactory<LoginPacket.LoginPacketResponse>("wt
         val type = readByte()
         println("type=$type")
 
-        debugDiscardExact(2)
+        discardExact(2)
         val tlvMap: Map<Int, ByteArray> = this.readTLVMap()
         return when (type.toInt()) {
             0 -> onLoginSuccess(tlvMap, bot)
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotImpl.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotImpl.kt
index 7fae74ff2..7f958fd05 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotImpl.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotImpl.kt
@@ -28,7 +28,7 @@ abstract class BotImpl<N : BotNetworkHandler> constructor(
     @UseExperimental(MiraiExperimentalAPI::class)
     final override val uin: Long
         get() = account.id
-    final override val logger: MiraiLogger = configuration.logger ?: DefaultLogger("Bot($uin)")
+    final override val logger: MiraiLogger = configuration.logger ?: DefaultLogger("Bot($uin)").also { configuration.logger = it }
 
     init {
         @Suppress("LeakingThis")
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/BotConfiguration.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/BotConfiguration.kt
index 3bc7d89b0..fc18b658b 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/BotConfiguration.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/BotConfiguration.kt
@@ -4,7 +4,6 @@ import kotlinx.io.core.IoBuffer
 import net.mamoe.mirai.Bot
 import kotlin.coroutines.CoroutineContext
 import kotlin.coroutines.EmptyCoroutineContext
-import kotlin.coroutines.coroutineContext
 import kotlin.jvm.JvmStatic
 
 /**
@@ -26,7 +25,7 @@ class BotConfiguration {
     /**
      * 日志记录器
      */
-    var logger: PlatformLogger? = null
+    var logger: MiraiLogger? = null
 
     /**
      * 父 [CoroutineContext]