diff --git a/Wox.Plugin.SystemPlugins/BrowserBookmarks.cs b/Wox.Plugin.SystemPlugins/BrowserBookmarks.cs
index 4521a6c06..59a201f15 100644
--- a/Wox.Plugin.SystemPlugins/BrowserBookmarks.cs
+++ b/Wox.Plugin.SystemPlugins/BrowserBookmarks.cs
@@ -19,7 +19,7 @@ namespace Wox.Plugin.SystemPlugins
 
         protected override List<Result> QueryInternal(Query query)
         {
-            if (string.IsNullOrEmpty(query.RawQuery) || query.RawQuery.EndsWith(" ") || query.RawQuery.Length <= 1) return new List<Result>();
+            if (query.RawQuery.EndsWith(" ") || query.RawQuery.Length <= 1) return new List<Result>();
 
             var fuzzyMather = FuzzyMatcher.Create(query.RawQuery);
             List<Bookmark> returnList = bookmarks.Where(o => MatchProgram(o, fuzzyMather)).ToList();
diff --git a/Wox.Plugin.SystemPlugins/Calculator.cs b/Wox.Plugin.SystemPlugins/Calculator.cs
index 9453851dd..7968c4b95 100644
--- a/Wox.Plugin.SystemPlugins/Calculator.cs
+++ b/Wox.Plugin.SystemPlugins/Calculator.cs
@@ -33,8 +33,7 @@ namespace Wox.Plugin.SystemPlugins
 
         protected override List<Result> QueryInternal(Query query)
         {
-            if (string.IsNullOrEmpty(query.RawQuery)
-                || query.RawQuery.Length <= 2          // don't affect when user only input "e" or "i" keyword
+            if (query.RawQuery.Length <= 2          // don't affect when user only input "e" or "i" keyword
                 || !regValidExpressChar.IsMatch(query.RawQuery) 
                 || !IsBracketComplete(query.RawQuery)) return new List<Result>();
 
diff --git a/Wox.Plugin.SystemPlugins/Program/Programs.cs b/Wox.Plugin.SystemPlugins/Program/Programs.cs
index 3d45e5364..f1906f8c5 100644
--- a/Wox.Plugin.SystemPlugins/Program/Programs.cs
+++ b/Wox.Plugin.SystemPlugins/Program/Programs.cs
@@ -51,7 +51,7 @@ namespace Wox.Plugin.SystemPlugins.Program
 
         protected override List<Result> QueryInternal(Query query)
         {
-            if (string.IsNullOrEmpty(query.RawQuery) || query.RawQuery.EndsWith(" ") || query.RawQuery.Length <= 1) return new List<Result>();
+            if (query.RawQuery.EndsWith(" ") || query.RawQuery.Length <= 1) return new List<Result>();
 
             var fuzzyMather = FuzzyMatcher.Create(query.RawQuery);
             List<Program> returnList = installedList.Where(o => MatchProgram(o, fuzzyMather)).ToList();
diff --git a/Wox.Plugin.SystemPlugins/Sys.cs b/Wox.Plugin.SystemPlugins/Sys.cs
index fd85057f2..c4fdb5561 100644
--- a/Wox.Plugin.SystemPlugins/Sys.cs
+++ b/Wox.Plugin.SystemPlugins/Sys.cs
@@ -25,7 +25,7 @@ namespace Wox.Plugin.SystemPlugins
 
         protected override List<Result> QueryInternal(Query query)
         {
-            if (string.IsNullOrEmpty(query.RawQuery) || query.RawQuery.EndsWith(" ") || query.RawQuery.Length <= 1) return new List<Result>();
+            if (query.RawQuery.EndsWith(" ") || query.RawQuery.Length <= 1) return new List<Result>();
 
             List<Result> results = new List<Result>();
 
diff --git a/Wox.Plugin.SystemPlugins/ThirdpartyPluginIndicator.cs b/Wox.Plugin.SystemPlugins/ThirdpartyPluginIndicator.cs
index a81cd036d..d1759b17e 100644
--- a/Wox.Plugin.SystemPlugins/ThirdpartyPluginIndicator.cs
+++ b/Wox.Plugin.SystemPlugins/ThirdpartyPluginIndicator.cs
@@ -16,7 +16,6 @@ namespace Wox.Plugin.SystemPlugins
         protected override List<Result> QueryInternal(Query query)
         {
             List<Result> results = new List<Result>();
-            if (string.IsNullOrEmpty(query.RawQuery)) return results;
 
             foreach (PluginMetadata metadata in allPlugins.Select(o => o.Metadata))
             {
diff --git a/Wox.Plugin.SystemPlugins/WebSearch/WebSearchPlugin.cs b/Wox.Plugin.SystemPlugins/WebSearch/WebSearchPlugin.cs
index b4c7830ef..eeefdc360 100644
--- a/Wox.Plugin.SystemPlugins/WebSearch/WebSearchPlugin.cs
+++ b/Wox.Plugin.SystemPlugins/WebSearch/WebSearchPlugin.cs
@@ -18,7 +18,6 @@ namespace Wox.Plugin.SystemPlugins
         protected override List<Result> QueryInternal(Query query)
         {
             List<Result> results = new List<Result>();
-            if (string.IsNullOrEmpty(query.ActionName)) return results;
 
             WebSearch webSearch =
                 UserSettingStorage.Instance.WebSearches.FirstOrDefault(o => o.ActionWord == query.ActionName && o.Enabled);