diff --git a/program/lib/Roundcube/rcube_plugin_api.php b/program/lib/Roundcube/rcube_plugin_api.php
index 1a10b8de2..9bc60f639 100644
--- a/program/lib/Roundcube/rcube_plugin_api.php
+++ b/program/lib/Roundcube/rcube_plugin_api.php
@@ -95,7 +95,7 @@ class rcube_plugin_api
 
         foreach ($this->plugins as $plugin) {
             // ... task, request type and framed mode
-            if (!$this->filter($plugin)) {
+            if (!$this->plugins_initialized[$plugin_name] && !$this->filter($plugin)) {
                 $plugin->init();
                 $this->plugins_initialized[$plugin->ID] = $plugin;
             }
@@ -132,7 +132,7 @@ class rcube_plugin_api
 
             // load required core plugin if no derivate was found
             if (!$loaded) {
-                $loaded = $this->load_plugin($plugin_name, true);
+                $loaded = $this->load_plugin($plugin_name);
             }
 
             // trigger fatal error if still not loaded