diff --git a/app/src/main/java/io/legado/app/data/entities/RssArticle.kt b/app/src/main/java/io/legado/app/data/entities/RssArticle.kt
index 4f24761e3..1c89ff8ca 100644
--- a/app/src/main/java/io/legado/app/data/entities/RssArticle.kt
+++ b/app/src/main/java/io/legado/app/data/entities/RssArticle.kt
@@ -1,6 +1,7 @@
 package io.legado.app.data.entities
 
 import androidx.room.Entity
+import androidx.room.Ignore
 import androidx.room.PrimaryKey
 
 
@@ -9,7 +10,7 @@ data class RssArticle(
     var origin: String = "",
     var time: Long = System.currentTimeMillis(),
     @PrimaryKey
-    var guid: String? = null,
+    var guid: String = "",
     var title: String? = null,
     var author: String? = null,
     var link: String? = null,
@@ -17,5 +18,10 @@ data class RssArticle(
     var description: String? = null,
     var content: String? = null,
     var image: String? = null,
-    var categories: MutableList<String> = mutableListOf()
-)
\ No newline at end of file
+    var categories: String? = null
+) {
+
+    @Ignore
+    var categoryList: MutableList<String> = mutableListOf()
+
+}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/model/rss/RssParser.kt b/app/src/main/java/io/legado/app/model/rss/RssParser.kt
index 2696fb26a..accd22de0 100644
--- a/app/src/main/java/io/legado/app/model/rss/RssParser.kt
+++ b/app/src/main/java/io/legado/app/model/rss/RssParser.kt
@@ -42,7 +42,7 @@ object RssParser {
                     xmlPullParser.name.equals(RSSKeywords.RSS_ITEM_AUTHOR, true) ->
                         if (insideItem) currentArticle.author = xmlPullParser.nextText().trim()
                     xmlPullParser.name.equals(RSSKeywords.RSS_ITEM_CATEGORY, true) ->
-                        if (insideItem) currentArticle.categories.add(xmlPullParser.nextText().trim())
+                        if (insideItem) currentArticle.categoryList.add(xmlPullParser.nextText().trim())
                     xmlPullParser.name.equals(RSSKeywords.RSS_ITEM_THUMBNAIL, true) ->
                         if (insideItem) currentArticle.image =
                             xmlPullParser.getAttributeValue(null, RSSKeywords.RSS_ITEM_URL)
@@ -92,6 +92,7 @@ object RssParser {
             ) {
                 // The item is correctly parsed
                 insideItem = false
+                currentArticle.categories = currentArticle.categoryList.joinToString(",")
                 articleList.add(currentArticle)
                 currentArticle = RssArticle()
             }