diff --git a/src/modules/launcher/Plugins/Wox.Plugin.Indexer/Main.cs b/src/modules/launcher/Plugins/Wox.Plugin.Indexer/Main.cs
index 8d6af797e9..b547815e76 100644
--- a/src/modules/launcher/Plugins/Wox.Plugin.Indexer/Main.cs
+++ b/src/modules/launcher/Plugins/Wox.Plugin.Indexer/Main.cs
@@ -87,11 +87,15 @@ namespace Wox.Plugin.Indexer
                         results.Add(r);
                     }
                 }
+                catch(InvalidOperationException)
+                {
+                    //The connection has closed, internal error of ExecuteReader()
+                    //Not showing this exception to the users
+                }
                 catch (Exception ex)
                 {
                     results.Add(new Result
                     {
-                        // TODO: Localize the string
                         Title = ex.ToString(),
                         IcoPath = "Images\\WindowsIndexerImg.bmp"
                     });
diff --git a/src/modules/launcher/Plugins/Wox.Plugin.Indexer/SearchHelper/WindowsSearchAPI.cs b/src/modules/launcher/Plugins/Wox.Plugin.Indexer/SearchHelper/WindowsSearchAPI.cs
index fb7b6ffcd1..857baea11b 100644
--- a/src/modules/launcher/Plugins/Wox.Plugin.Indexer/SearchHelper/WindowsSearchAPI.cs
+++ b/src/modules/launcher/Plugins/Wox.Plugin.Indexer/SearchHelper/WindowsSearchAPI.cs
@@ -10,9 +10,12 @@ namespace Wox.Plugin.Indexer.SearchHelper
         public OleDbConnection conn;
         public OleDbCommand command;
         public OleDbDataReader WDSResults;
+        private readonly object _lock = new object();
+        
 
-        public IEnumerable<SearchResult> ExecuteQuery(ISearchQueryHelper queryHelper, string keyword)
+        public List<SearchResult> ExecuteQuery(ISearchQueryHelper queryHelper, string keyword)
         {
+            List<SearchResult> _Result = new List<SearchResult>();
             // Generate SQL from our parameters, converting the userQuery from AQS->WHERE clause
             string sqlQuery = queryHelper.GenerateSQLFromUserQuery(keyword);
 
@@ -29,19 +32,19 @@ namespace Wox.Plugin.Indexer.SearchHelper
                     // execute the command, which returns the results as an OleDbDataReader.
                     using (WDSResults = command.ExecuteReader())
                     {
-                        while (WDSResults.Read())
+                        if(WDSResults.HasRows)
                         {
-                            // col 0 is our path in display format
-                            if (WDSResults.GetString(0) != null)
+                            while (WDSResults.Read() && WDSResults.GetValue(0) != DBNull.Value)
                             {
                                 var result = new SearchResult { Path = WDSResults.GetString(0) };
-                                yield return result;
+                                _Result.Add(result);
                             }
                         }
                     }
-
                 }
             }
+
+            return _Result;
         }
 
 
@@ -91,10 +94,12 @@ namespace Wox.Plugin.Indexer.SearchHelper
 
         public IEnumerable<SearchResult> Search(string keyword, string pattern = "*", int maxCount = 100)
         {
-            ISearchQueryHelper queryHelper;
-            InitQueryHelper(out queryHelper, maxCount);
-            ModifyQueryHelper(ref queryHelper, pattern);
-            return ExecuteQuery(queryHelper, keyword);
+            lock(_lock){
+                ISearchQueryHelper queryHelper;
+                InitQueryHelper(out queryHelper, maxCount);
+                ModifyQueryHelper(ref queryHelper, pattern);
+                return ExecuteQuery(queryHelper, keyword);
+            }
         }
     }
 }
diff --git a/src/modules/launcher/Wox.Test/Plugins/WindowsIndexerTest.cs b/src/modules/launcher/Wox.Test/Plugins/WindowsIndexerTest.cs
index 9df2aa5892..fae98e9ab8 100644
--- a/src/modules/launcher/Wox.Test/Plugins/WindowsIndexerTest.cs
+++ b/src/modules/launcher/Wox.Test/Plugins/WindowsIndexerTest.cs
@@ -132,14 +132,33 @@ namespace Wox.Test.Plugins
             _api.InitQueryHelper(out queryHelper, 10);
             _api.ModifyQueryHelper(ref queryHelper, "*");
             string keyword = "test";
+            bool commandDisposed = false;
+            bool resultDisposed = false;
 
             // Act
             _api.ExecuteQuery(queryHelper, keyword);
+            try
+            {
+                _api.command.ExecuteReader();
+            }
+            catch(InvalidOperationException)
+            {
+                commandDisposed = true;
+            }
+
+            try
+            {
+                _api.WDSResults.Read();
+            }
+            catch(InvalidOperationException)
+            {
+                resultDisposed = true;
+            }
 
             // Assert
-            Assert.IsNull(_api.conn);
-            Assert.IsNull(_api.command);
-            Assert.IsNull(_api.WDSResults);
+            Assert.IsTrue(_api.conn.State == System.Data.ConnectionState.Closed);
+            Assert.IsTrue(commandDisposed);
+            Assert.IsTrue(resultDisposed);
         }
     }
 }
diff --git a/src/modules/launcher/Wox/Wox.csproj b/src/modules/launcher/Wox/Wox.csproj
index 9cd729e8a3..d91f963f3f 100644
--- a/src/modules/launcher/Wox/Wox.csproj
+++ b/src/modules/launcher/Wox/Wox.csproj
@@ -66,11 +66,12 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
+
+    <PackageReference Include="System.Data.OleDb" Version="4.7.0" />
     <PackageReference Include="PropertyChanged.Fody" Version="3.2.7" />
     <PackageReference Include="System.Data.SQLite" Version="1.0.112" />
     <PackageReference Include="System.Data.SQLite.Core" Version="1.0.112" />
     <PackageReference Include="System.Runtime" Version="4.3.1" />
-    <PackageReference Include="System.Data.OleDb" Version="5.0.0-preview.2.20160.6" />
     <PackageReference Include="tlbimp-Microsoft.Search.Interop" Version="1.0.0" />
   </ItemGroup>