diff --git a/YACReaderLibrary/yacreader_local_server.cpp b/YACReaderLibrary/yacreader_local_server.cpp
index 17ba3aa5..9ce31f54 100644
--- a/YACReaderLibrary/yacreader_local_server.cpp
+++ b/YACReaderLibrary/yacreader_local_server.cpp
@@ -11,6 +11,8 @@
 
 using namespace YACReader;
 
+QMutex YACReaderClientConnectionWorker::dbMutex;
+
 YACReaderLocalServer::YACReaderLocalServer(QObject *parent) :
 	QThread(parent)
 {
@@ -145,12 +147,14 @@ void YACReaderClientConnectionWorker::run()
 
 void YACReaderClientConnectionWorker::getComicInfo(quint64 libraryId, ComicDB & comic, QList<ComicDB> & siblings)
 {
+	QMutexLocker locker(&dbMutex);
 	comic = DBHelper::getComicInfo(DBHelper::getLibrariesNames().at(libraryId), comic.id);
 	siblings = DBHelper::getSiblings(DBHelper::getLibrariesNames().at(libraryId), comic.parentId);
 }
 
 void YACReaderClientConnectionWorker::updateComic(quint64 libraryId, ComicDB & comic)
 {
+	QMutexLocker locker(&dbMutex);
 	DBHelper::update(DBHelper::getLibrariesNames().at(libraryId), comic.info);
 	emit comicUpdated(libraryId, comic);
 }
diff --git a/YACReaderLibrary/yacreader_local_server.h b/YACReaderLibrary/yacreader_local_server.h
index 45e4be09..34b59ccf 100644
--- a/YACReaderLibrary/yacreader_local_server.h
+++ b/YACReaderLibrary/yacreader_local_server.h
@@ -3,6 +3,7 @@
 
 #include <QObject>
 #include <QThread>
+#include <QMutex>
 
 class QLocalServer;
 class QLocalSocket;
@@ -35,6 +36,7 @@ public:
 signals:
 	void comicUpdated(quint64 libraryId, const ComicDB & comic);
 private:
+	static QMutex dbMutex;
 	void run();
 	
 	void getComicInfo(quint64 libraryId, ComicDB & comic, QList<ComicDB> & sibling);