diff --git a/server/core/WebWorker.js b/server/core/WebWorker.js
index 2cb8b4c..387edfb 100644
--- a/server/core/WebWorker.js
+++ b/server/core/WebWorker.js
@@ -395,6 +395,8 @@ class WebWorker {
     }
 
     async restoreBookFile(publicPath) {
+        this.checkMyState();
+
         try {
             const db = this.db;
             const hash = path.basename(publicPath);
@@ -418,6 +420,8 @@ class WebWorker {
     }
 
     async getDownFileName(publicPath) {
+        this.checkMyState();
+
         const db = this.db;
         const hash = path.basename(publicPath);
 
diff --git a/server/index.js b/server/index.js
index 51f63f8..aed3b5c 100644
--- a/server/index.js
+++ b/server/index.js
@@ -23,7 +23,7 @@ function showHelp() {
 
 Options:
   --help              Print ${config.name} command line options
-  --app-dir=<dirpath> Set application working directory, default: "<execDir>/.${config.name}"
+  --app-dir=<dirpath> Set application working directory, default: <execDir>/.${config.name}
   --lib-dir=<dirpath> Set library directory, default: the same as ${config.name} executable's
   --inpx=<filepath>   Set INPX collection file, default: the one that found in library dir
   --recreate          Force recreation of the search database on start