diff --git a/winixd/core/plugin.cpp b/winixd/core/plugin.cpp
index 232a8c9..72383f8 100644
--- a/winixd/core/plugin.cpp
+++ b/winixd/core/plugin.cpp
@@ -4,8 +4,8 @@
  * Author: Tomasz Sowa <t.sowa@ttmath.org>
  */
 
-/* 
- * Copyright (c) 2008-2022, Tomasz Sowa
+/*
+ * Copyright (c) 2008-2023, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -370,10 +370,13 @@ PluginRes Plugin::Call(morm::ModelConnector * model_connector, Log * plog, Cur *
 
 		Call(model_connector, plog, cur, message, i, info);
 
-		if( info.res )
-			++res.res_true;
-		else
-			++res.res_false;
+		if( info.has_res )
+		{
+			if( info.res )
+				++res.res_true;
+			else
+				++res.res_false;
+		}
 	}
 
 	current_plugin = old_current_plugin;
diff --git a/winixd/core/plugin.h b/winixd/core/plugin.h
index e672b54..73deb65 100644
--- a/winixd/core/plugin.h
+++ b/winixd/core/plugin.h
@@ -4,8 +4,8 @@
  * Author: Tomasz Sowa <t.sowa@ttmath.org>
  */
 
-/* 
- * Copyright (c) 2008-2022, Tomasz Sowa
+/*
+ * Copyright (c) 2008-2023, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -120,6 +120,12 @@ struct PluginInfo
 	// to create your plugin's session data
 	PluginDataBase * plugin_data_base; // !! zmienic nazwe na plugin_session_base ? a moze session_base; a moze plugin_session?
 
+	// whether or not there is a res (bool) value set
+	// default: true
+	// if set to false then the 'res' is not taken into account when calculating how many plugins
+	// have returned true or false
+	bool has_res;
+
 	// function return status
 	// default: false (if not set by the plugin)
 	bool res;
@@ -137,6 +143,7 @@ struct PluginInfo
 		plugin_id			= -1;
 		plugin_data_base	= 0;
 
+		has_res = true;
 		res = false;
 	}