diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsoleImplementation.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsoleImplementation.kt
index f4372f198..94aee7ae3 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsoleImplementation.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsoleImplementation.kt
@@ -189,6 +189,7 @@ public interface MiraiConsoleImplementation : CoroutineScope {
         @ConsoleFrontEndImplementation
         @Throws(MalformedMiraiConsoleImplementationError::class)
         public fun MiraiConsoleImplementation.start(): Unit = initLock.withLock {
+            if (::instance.isInitialized) error("Mirai Console is already initialized.")
             this@Companion.instance = this
             MiraiConsoleImplementationBridge.doStart()
         }