diff --git a/library/src/main/java/com/liulishuo/filedownloader/DownloadTask.java b/library/src/main/java/com/liulishuo/filedownloader/DownloadTask.java
index ebae4d6d..e53c59c4 100644
--- a/library/src/main/java/com/liulishuo/filedownloader/DownloadTask.java
+++ b/library/src/main/java/com/liulishuo/filedownloader/DownloadTask.java
@@ -355,11 +355,8 @@ public int getId() {
             return mId;
         }
 
-        if (!TextUtils.isEmpty(mPath) && !TextUtils.isEmpty(mUrl)) {
-            return mId = FileDownloadUtils.generateId(mUrl, mPath, mPathAsDirectory);
-        }
-
-        return 0;
+        mId = FileDownloadUtils.generateId(mUrl, mPath, mPathAsDirectory);
+        return mId;
     }
 
     /**
diff --git a/library/src/main/java/com/liulishuo/filedownloader/util/FileDownloadUtils.java b/library/src/main/java/com/liulishuo/filedownloader/util/FileDownloadUtils.java
index 01c3e50c..5bc38c97 100644
--- a/library/src/main/java/com/liulishuo/filedownloader/util/FileDownloadUtils.java
+++ b/library/src/main/java/com/liulishuo/filedownloader/util/FileDownloadUtils.java
@@ -222,6 +222,8 @@ public static int generateId(final String url, final String path) {
      */
     public static int generateId(final String url, final String path,
                                  final boolean pathAsDirectory) {
+        if (url == null || url.length() == 0) return 0;
+        if (path == null || path.length() == 0) return 0;
         return CustomComponentHolder.getImpl().getIdGeneratorInstance()
                 .generateId(url, path, pathAsDirectory);
     }