diff --git "a/C:\\Users\\kmaslyuk\\AppData\\Local\\Temp\\TortoiseGit\\btc8BAC.tmp\\btconfigcore-a98a0a8-left.h" "b/D:\\dev\\mini__\\src\\backend\\config\\btconfigcore.h"
index 54617b5..7d243ee 100644
--- "a/C:\\Users\\kmaslyuk\\AppData\\Local\\Temp\\TortoiseGit\\btc8BAC.tmp\\btconfigcore-a98a0a8-left.h"
+++ "b/D:\\dev\\mini__\\src\\backend\\config\\btconfigcore.h"
@@ -16,6 +16,7 @@
 
 #include <QCoreApplication>
 #include <QHash>
+#include <QMutex>
 #include <QStringList>
 
 
@@ -107,6 +108,7 @@ public: /* Methods: */
     */
     template<typename T>
     inline T value(const QString & key, const T & defaultValue = T()) {
+        QMutexLocker l(&m_mutex);
         return m_settings.value(group() + key,
                                 QVariant::fromValue(defaultValue)).template value<T>();
     }
@@ -120,6 +122,7 @@ public: /* Methods: */
     */
     template<typename T>
     inline T sessionValue(const QString & key, const T & defaultValue = T()) {
+        QMutexLocker l(&m_mutex);
         return m_settings.value(m_cachedCurrentSessionGroup + group() + key,
                                 QVariant::fromValue(defaultValue)).template value<T>();
     }
@@ -132,6 +135,7 @@ public: /* Methods: */
     */
     template<typename T>
     inline void setValue(const QString & key, const T & value) {
+        QMutexLocker l(&m_mutex);
         m_settings.setValue(group() + key, QVariant::fromValue<T>(value));
     }
 
@@ -143,6 +147,7 @@ public: /* Methods: */
     */
     template<typename T>
     inline void setSessionValue(const QString & key, const T & value) {
+        QMutexLocker l(&m_mutex);
         m_settings.setValue(m_cachedCurrentSessionGroup + group() + key,
                             QVariant::fromValue<T>(value));
     }
@@ -270,6 +275,9 @@ private: /* Fields: */
     static const QString GROUP_SESSION;
     static const QString KEY_SESSION_NAME;
     static const QString UI_FONT_SIZE;
+
+    // Requider for asynchronous value() calls.
+    QMutex m_mutex;
 };
 
 #endif // BTCONFIGCORE_H