diff --git a/app/src/main/java/com/hippo/ehviewer/preference/RestoreDownloadPreference.java b/app/src/main/java/com/hippo/ehviewer/preference/RestoreDownloadPreference.java
index 4d2476e7f..be5879127 100644
--- a/app/src/main/java/com/hippo/ehviewer/preference/RestoreDownloadPreference.java
+++ b/app/src/main/java/com/hippo/ehviewer/preference/RestoreDownloadPreference.java
@@ -90,6 +90,9 @@ public class RestoreDownloadPreference extends TaskPreference {
             try {
                 is = siFile.openInputStream();
                 SpiderInfo spiderInfo = SpiderInfo.read(is);
+                if (spiderInfo == null) {
+                    return null;
+                }
                 long gid = spiderInfo.gid;
                 if (mManager.containDownloadInfo(gid)) {
                     return null;
diff --git a/app/src/main/java/com/hippo/ehviewer/spider/SpiderInfo.java b/app/src/main/java/com/hippo/ehviewer/spider/SpiderInfo.java
index 25f1b307a..98747bb8c 100644
--- a/app/src/main/java/com/hippo/ehviewer/spider/SpiderInfo.java
+++ b/app/src/main/java/com/hippo/ehviewer/spider/SpiderInfo.java
@@ -94,6 +94,7 @@ public class SpiderInfo {
         }
     }
 
+    @Nullable
     @SuppressWarnings("InfiniteLoopStatement")
     public static SpiderInfo read(@Nullable InputStream is) {
         if (null == is) {