diff --git a/src/launcherlib/daemon.cpp b/src/launcherlib/daemon.cpp
index 172f3a4..1d88f3a 100644
--- a/src/launcherlib/daemon.cpp
+++ b/src/launcherlib/daemon.cpp
@@ -32,6 +32,7 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <sys/prctl.h>
+#include <sys/syslog.h>
 #include <fcntl.h>
 #include <dlfcn.h>
 #include <glob.h>
@@ -278,7 +279,11 @@ void Daemon::readFromBoosterSocket(int fd)
     }
     else
     {
-        Logger::logWarning("Daemon: Nothing read from the socket\n");
+        // Since Logger is not working in boosters log directly to syslog
+        syslog(LOG_ERR,"Daemon: Nothing read from the socket\n");
+        Logger::logError("Daemon: Nothing read from the socket\n");
+        // Critical error communicating with booster. Exiting applauncherd.
+        _exit(EXIT_FAILURE);
     }
 
     // Fork a new booster of the given type
@@ -375,6 +380,15 @@ void Daemon::loadBoosterPlugins()
 
 void Daemon::forkBooster(char type, int sleepTime)
 {
+    if (!BoosterPluginRegistry::pluginEntry(type)) {
+        // Since Logger is not working in boosters log directly to syslog
+        syslog(LOG_ERR,"Daemon: Unknown booster type '%c'\n",type);
+        Logger::logError("Daemon: Unknown booster type '%c'\n",type);
+        // Critical error unknown booster type. Exiting applauncherd.
+        _exit(EXIT_FAILURE);
+    }
+
+
     // Invalidate current booster pid for the given type
     setPidToBooster(type, 0);
 
diff --git a/tests/common/unittests/ut_daemon/ut_daemon.cpp b/tests/common/unittests/ut_daemon/ut_daemon.cpp
index d383494..112c239 100644
--- a/tests/common/unittests/ut_daemon/ut_daemon.cpp
+++ b/tests/common/unittests/ut_daemon/ut_daemon.cpp
@@ -101,4 +101,52 @@ void Ut_Daemon::testSetPidToBooster()
     QVERIFY(m_subject->boosterPidForType('c') == 0);
 }
 
-QTEST_APPLESS_MAIN(Ut_Daemon);
+void Ut_Daemon::testLock()
+{
+    //negative testcase with already locked soket (it's locked by running applauncherd)
+    QVERIFY(Daemon::lock() == false);
+
+    //negative testcase with wrong lock file descriptor
+    Daemon::unlock();
+    m_subject->m_lockFd = -1;
+    QVERIFY(Daemon::lock() == false);
+}
+
+void Ut_Daemon::testForkBooster()
+{
+    //negative testcase for unregistered booster type '0'
+    pid_t pid = fork();
+    if (pid == 0) { // child
+        // Code only executed by child process
+        m_subject->forkBooster('0');
+        QFAIL("Not exited on invalid booster type");
+        _exit(0); //exit from child if something goes wrong
+    } else if (pid < 0) { // failed to fork
+        QFAIL("Unable to fork for test _exit");
+    } else { //parent only
+        QTest::qSleep(1000);
+        int resultCode = QProcess::execute("grep",QStringList() << "Daemon: Unknown booster type '0'" << "/var/log/syslog");
+        QVERIFY(resultCode == 0);
+    }
+}
+
+
+void Ut_Daemon::testReadFromBoosterSocket()
+{
+    //negative testcase reads from invalid socket
+    pid_t pid = fork();
+    if (pid == 0) { // child
+        // Code only executed by child process
+        m_subject->readFromBoosterSocket(-1);
+        QFAIL("Not exited on invalid socket");
+        _exit(0); //exit from child if something goes wrong
+    } else if (pid < 0) { // failed to fork
+        QFAIL("Unable to fork for test _exit");
+    } else { //parent only
+        QTest::qSleep(1000);
+        int resultCode = QProcess::execute("grep",QStringList() << "Daemon: Nothing read from the socket" << "/var/log/syslog");
+        QVERIFY(resultCode == 0);
+    }
+}
+
+QTEST_APPLESS_MAIN(Ut_Daemon)
diff --git a/tests/common/unittests/ut_daemon/ut_daemon.h b/tests/common/unittests/ut_daemon/ut_daemon.h
index 6e9141a..455d45a 100644
--- a/tests/common/unittests/ut_daemon/ut_daemon.h
+++ b/tests/common/unittests/ut_daemon/ut_daemon.h
@@ -45,6 +45,9 @@ private Q_SLOTS:
     void testVerifyInstance();
     void testReapZombies();
     void testSetPidToBooster();
+    void testLock();
+    void testForkBooster();
+    void testReadFromBoosterSocket();
 
 private:
     std::tr1::shared_ptr<Daemon> m_subject;