diff --git a/ERRORCODES.md b/ERRORCODES.md
index f1eb98ca5..dd2a9d9a0 100644
--- a/ERRORCODES.md
+++ b/ERRORCODES.md
@@ -20,3 +20,4 @@ ERR_1013 | No unique match for book number within series
 ERR_1014 | No match for book number within series
 ERR_1015 | Error while deserializing ComicRack ReadingList
 ERR_1016 | Directory not accessible or not a directory
+ERR_1017 | Cannot scan folder that is part of an existing library
diff --git a/komga-webui/src/locales/en.json b/komga-webui/src/locales/en.json
index 770c27745..d080a32d9 100644
--- a/komga-webui/src/locales/en.json
+++ b/komga-webui/src/locales/en.json
@@ -434,7 +434,9 @@
     "ERR_1012": "No match for series",
     "ERR_1013": "No unique match for book number within series",
     "ERR_1014": "No match for book number within series",
-    "ERR_1015": "Error while deserializing ComicRack ReadingList"
+    "ERR_1015": "Error while deserializing ComicRack ReadingList",
+    "ERR_1016": "Directory not accessible or not a directory",
+    "ERR_1017": "Cannot scan folder that is part of an existing library"
   },
   "filter": {
     "age_rating": "age rating",
diff --git a/komga-webui/src/services/komga-transientbooks.service.ts b/komga-webui/src/services/komga-transientbooks.service.ts
index e9709048f..7bf7e7b32 100644
--- a/komga-webui/src/services/komga-transientbooks.service.ts
+++ b/komga-webui/src/services/komga-transientbooks.service.ts
@@ -6,25 +6,22 @@ const API_TRANSIENT_BOOKS = '/api/v1/transient-books'
 export default class KomgaTransientBooksService {
   private http: AxiosInstance
 
-  constructor (http: AxiosInstance) {
+  constructor(http: AxiosInstance) {
     this.http = http
   }
 
-  async scanForTransientBooks (path: string): Promise<TransientBookDto[]> {
+  async scanForTransientBooks(path: string): Promise<TransientBookDto[]> {
     try {
       return (await this.http.post(API_TRANSIENT_BOOKS, {
         path: path,
       })).data
     } catch (e) {
-      let msg = `An error occurred while trying to scan for transient book`
-      if (e.response.data.message) {
-        msg += `: ${e.response.data.message}`
-      }
-      throw new Error(msg)
+      if (e.response.data.message) throw new Error(e.response.data.message)
+      throw new Error('An error occurred while trying to scan for transient book')
     }
   }
 
-  async analyze (id: string): Promise<TransientBookDto> {
+  async analyze(id: string): Promise<TransientBookDto> {
     try {
       return (await this.http.post(`${API_TRANSIENT_BOOKS}/${id}/analyze`)).data
     } catch (e) {
diff --git a/komga-webui/src/views/BookImport.vue b/komga-webui/src/views/BookImport.vue
index 22073f885..c163d1f59 100644
--- a/komga-webui/src/views/BookImport.vue
+++ b/komga-webui/src/views/BookImport.vue
@@ -84,6 +84,19 @@
       </v-row>
     </template>
 
+    <v-snackbar
+      v-model="snackbar"
+      bottom
+      color="error"
+    >
+      {{ snackText }}
+      <v-btn
+        text
+        @click="snackbar = false"
+      >{{ $t('common.close') }}
+      </v-btn>
+    </v-snackbar>
+
   </v-container>
 </template>
 
@@ -96,6 +109,7 @@ import SeriesPickerDialog from "@/components/dialogs/SeriesPickerDialog.vue";
 import {SeriesDto} from "@/types/komga-series";
 import {BookImportBatchDto, BookImportDto} from "@/types/komga-books";
 import {CopyMode} from "@/types/enum-books";
+import {convertErrorCodes} from "@/functions/error-codes";
 
 export default Vue.extend({
   name: 'BookImport',
@@ -110,6 +124,8 @@ export default Vue.extend({
     transientBooks: [] as TransientBookDto[],
     copyMode: CopyMode.HARDLINK,
     importFinished: false,
+    snackbar: false,
+    snackText: '',
   }),
   computed: {
     globalSelect: {
@@ -146,7 +162,11 @@ export default Vue.extend({
   methods: {
     async scanBooks() {
       this.transientBooks = []
-      this.transientBooks = await this.$komgaTransientBooks.scanForTransientBooks(this.importPath)
+      try {
+        this.transientBooks = await this.$komgaTransientBooks.scanForTransientBooks(this.importPath)
+      } catch (e) {
+        this.showSnack(convertErrorCodes(e.message))
+      }
       this.selected = this.$_.range(this.transientBooks.length)
       this.payloads = this.payloads.splice(this.transientBooks.length, this.payloads.length)
       this.importFinished = false
@@ -157,6 +177,10 @@ export default Vue.extend({
         this.importFinished = true
       }
     },
+    showSnack(message: string) {
+      this.snackText = message
+      this.snackbar = true
+    },
   },
 })
 </script>
diff --git a/komga/src/main/kotlin/org/gotson/komga/domain/service/TransientBookLifecycle.kt b/komga/src/main/kotlin/org/gotson/komga/domain/service/TransientBookLifecycle.kt
index 349a7fe7a..4bc466810 100644
--- a/komga/src/main/kotlin/org/gotson/komga/domain/service/TransientBookLifecycle.kt
+++ b/komga/src/main/kotlin/org/gotson/komga/domain/service/TransientBookLifecycle.kt
@@ -4,6 +4,8 @@ import org.gotson.komga.domain.model.BookPageContent
 import org.gotson.komga.domain.model.BookWithMedia
 import org.gotson.komga.domain.model.Media
 import org.gotson.komga.domain.model.MediaNotReadyException
+import org.gotson.komga.domain.model.PathContainedInPath
+import org.gotson.komga.domain.persistence.LibraryRepository
 import org.gotson.komga.domain.persistence.TransientBookRepository
 import org.springframework.stereotype.Service
 import java.nio.file.Paths
@@ -13,10 +15,17 @@ class TransientBookLifecycle(
   private val transientBookRepository: TransientBookRepository,
   private val bookAnalyzer: BookAnalyzer,
   private val fileSystemScanner: FileSystemScanner,
+  private val libraryRepository: LibraryRepository,
 ) {
 
   fun scanAndPersist(filePath: String): List<BookWithMedia> {
-    val books = fileSystemScanner.scanRootFolder(Paths.get(filePath)).values.flatten().map { BookWithMedia(it, Media()) }
+    val folderToScan = Paths.get(filePath)
+
+    libraryRepository.findAll().forEach { library ->
+      if (folderToScan.startsWith(library.path())) throw PathContainedInPath("Cannot scan folder that is part of an existing library", "ERR_1017")
+    }
+
+    val books = fileSystemScanner.scanRootFolder(folderToScan).values.flatten().map { BookWithMedia(it, Media()) }
 
     transientBookRepository.saveAll(books)
 
diff --git a/komga/src/main/kotlin/org/gotson/komga/interfaces/rest/TransientBooksController.kt b/komga/src/main/kotlin/org/gotson/komga/interfaces/rest/TransientBooksController.kt
index 312593eb7..f88ab239b 100644
--- a/komga/src/main/kotlin/org/gotson/komga/interfaces/rest/TransientBooksController.kt
+++ b/komga/src/main/kotlin/org/gotson/komga/interfaces/rest/TransientBooksController.kt
@@ -3,7 +3,7 @@ package org.gotson.komga.interfaces.rest
 import com.jakewharton.byteunits.BinaryByteUnit
 import mu.KotlinLogging
 import org.gotson.komga.domain.model.BookWithMedia
-import org.gotson.komga.domain.model.DirectoryNotFoundException
+import org.gotson.komga.domain.model.CodedException
 import org.gotson.komga.domain.model.MediaNotReadyException
 import org.gotson.komga.domain.model.ROLE_ADMIN
 import org.gotson.komga.domain.persistence.TransientBookRepository
@@ -43,7 +43,7 @@ class TransientBooksController(
       transientBookLifecycle.scanAndPersist(request.path)
         .sortedBy { it.book.path() }
         .map { it.toDto() }
-    } catch (e: DirectoryNotFoundException) {
+    } catch (e: CodedException) {
       throw ResponseStatusException(HttpStatus.BAD_REQUEST, e.code)
     }