diff --git a/app/src/main/assets/updateLog.md b/app/src/main/assets/updateLog.md
index 1d51f30bb..74f3402d3 100644
--- a/app/src/main/assets/updateLog.md
+++ b/app/src/main/assets/updateLog.md
@@ -12,12 +12,15 @@
 * 漫画源看书显示乱码，**阅读与其他软件的源并不通用**，请导入阅读的支持的漫画源！
 * 关于最近版本有时候界面没有数据的问题是因为把LiveData组件换成了谷歌推荐的Flow组件导致的问题,正在查找解决办法
 
-**2021/09/03**
+**2021/09/05**
 
 1. 采用exoPlayer播放音频,支持更多格式
 2. js规则内的@get,@put,{{}},不再在拆分时替换,都有对应的java函数,可以留着解析url时实时运算
 3. 替换不再阻塞
 4. 修复详情页初始化:规则bug
+5. 书源内的并发率生效,两种格式
+    * 时间 格式: 如 500, 访问间隔500毫秒
+    * 次数/时间 格式: 如 5/6000, 每分钟最多访问5次
 
 **2021/09/01**
 
diff --git a/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeUrl.kt b/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeUrl.kt
index 6489427c9..25c60a9b1 100644
--- a/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeUrl.kt
+++ b/app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeUrl.kt
@@ -277,30 +277,34 @@ class AnalyzeUrl(
             return
         }
         val waitTime = synchronized(fetchRecord) {
-            val rateIndex = concurrentRate.indexOf("/")
-            if (rateIndex == -1) {
-                val nextTime = fetchRecord.time + concurrentRate.toInt()
-                if (System.currentTimeMillis() >= nextTime) {
-                    fetchRecord.time = System.currentTimeMillis()
-                    fetchRecord.frequency = 1
-                    return@synchronized 0
-                }
-                return@synchronized nextTime - System.currentTimeMillis()
-            } else {
-                val sj = concurrentRate.substring(rateIndex + 1)
-                val nextTime = fetchRecord.time + sj.toInt()
-                if (System.currentTimeMillis() >= nextTime) {
-                    fetchRecord.time = System.currentTimeMillis()
-                    fetchRecord.frequency = 1
-                    return@synchronized 0
-                }
-                val cs = concurrentRate.substring(0, rateIndex)
-                if (fetchRecord.frequency > cs.toInt()) {
+            try {
+                val rateIndex = concurrentRate.indexOf("/")
+                if (rateIndex == -1) {
+                    val nextTime = fetchRecord.time + concurrentRate.toInt()
+                    if (System.currentTimeMillis() >= nextTime) {
+                        fetchRecord.time = System.currentTimeMillis()
+                        fetchRecord.frequency = 1
+                        return@synchronized 0
+                    }
                     return@synchronized nextTime - System.currentTimeMillis()
                 } else {
-                    fetchRecord.frequency = fetchRecord.frequency + 1
-                    return@synchronized 0
+                    val sj = concurrentRate.substring(rateIndex + 1)
+                    val nextTime = fetchRecord.time + sj.toInt()
+                    if (System.currentTimeMillis() >= nextTime) {
+                        fetchRecord.time = System.currentTimeMillis()
+                        fetchRecord.frequency = 1
+                        return@synchronized 0
+                    }
+                    val cs = concurrentRate.substring(0, rateIndex)
+                    if (fetchRecord.frequency > cs.toInt()) {
+                        return@synchronized nextTime - System.currentTimeMillis()
+                    } else {
+                        fetchRecord.frequency = fetchRecord.frequency + 1
+                        return@synchronized 0
+                    }
                 }
+            } catch (e: Exception) {
+                return@synchronized 0
             }
         }
         if (waitTime > 0) {