diff --git a/extension/qfq/qfq/store/Session.php b/extension/qfq/qfq/store/Session.php
index 594fcf069178e6b9d90a7f9cf8cece63faecc671..3b99dac488c279679b55ee2989005a5f31ae04ef 100644
--- a/extension/qfq/qfq/store/Session.php
+++ b/extension/qfq/qfq/store/Session.php
@@ -146,7 +146,7 @@ class Session {
      * Check if the recent logged in feUserUid is equal to the one stored in session: If different, invalidate (clear)
      * the session and save the new feUser, feUserUid in the session. If isset($GLOBALS["TSFE"]), than we're in a T3
      * environment, else we are called as API classes and need to fake feUser / feUserUid from previous stored session.
-     * It's neccessary to have feUser / feUserUid available in API classes, due to dynamic update which might reload
+     * It's necessary to have feUser / feUserUid available in API classes, due to dynamic update which might reload
      * data based on feUser / feUserUid.
      */
     private static function checkFeUserUid() {
diff --git a/extension/qfq/qfq/store/Store.php b/extension/qfq/qfq/store/Store.php
index b5f67ae6acb343249eeaa960ae9a2c6a4838a83e..255c2e83607acfbab0da356ead6a033421cc9e8a 100644
--- a/extension/qfq/qfq/store/Store.php
+++ b/extension/qfq/qfq/store/Store.php
@@ -12,6 +12,7 @@ use qfq;
 
 require_once(__DIR__ . '/../../qfq/helper/KeyValueStringParser.php');
 require_once(__DIR__ . '/../../qfq/helper/Sanitize.php');
+require_once(__DIR__ . '/../../qfq/helper/Logger.php');
 require_once(__DIR__ . '/../../qfq/Constants.php');
 require_once(__DIR__ . '/../../qfq/store/Sip.php');
 require_once(__DIR__ . '/../../qfq/store/T3Info.php');
@@ -428,9 +429,9 @@ class Store {
      * @param $key
      * @param $store
      */
-    public static function unsetVar($key, $store){
+    public static function unsetVar($key, $store) {
 
-        if(isset(self::$raw[$store][$key])) {
+        if (isset(self::$raw[$store][$key])) {
             unset(self::$raw[$store][$key]);
         }
     }
@@ -518,7 +519,7 @@ class Store {
     /**
      * Fills the STORE_EXTRA.
      *
-     * @param string $storeName   STORE_EXTRA, STORE_USER
+     * @param string $storeName STORE_EXTRA, STORE_USER
      * @throws CodeException
      * @throws UserFormException
      */
@@ -652,6 +653,13 @@ class Store {
                 $data = array();
             }
 
+            // Switch FeUser: log this to qfq.log
+            if ($storeName === STORE_USER && $key == TYPO3_FE_USER) {
+                $qfqLog = self::getVar(SYSTEM_QFQ_LOG, STORE_SYSTEM);
+                $feUserOld = isset($data[$key]) ? $data[$key] : self::getVar($key, STORE_TYPO3 . STORE_EMPTY);
+                Logger::logMessage(date('Y.m.d H:i:s ') . ": Switch feUser '$feUserOld' to '$value'", $qfqLog);
+            }
+
             $data[$key] = $value;
             Session::set($storeName, $data);
         }