--- src/log4qt/logmanager.cpp.orig	2018-01-08 08:23:00.303262244 +0100
+++ src/log4qt/logmanager.cpp	2018-01-08 08:23:19.259410697 +0100
@@ -291,7 +291,7 @@
 
     // Configuration using setting Configuration
     value = InitialisationHelper::setting(QLatin1String("Configuration"));
-    if (QFile::exists(value))
+    if (!value.isEmpty() && QFile::exists(value))
     {
         static_logger()->debug("Default initialisation configures from file '%1' specified by Configure", value);
         PropertyConfigurator::configure(value);
--- src/log4qt/helpers/configuratorhelper.cpp.orig	2018-01-15 12:44:43.783689106 +0100
+++ src/log4qt/helpers/configuratorhelper.cpp	2018-01-15 12:45:20.787982755 +0100
@@ -83,7 +83,8 @@
     mConfigurationFile.setFile(rFileName);
     mpConfigureFunc = nullptr;
     delete mpConfigurationFileWatch;
-    if (!QFileInfo::exists(rFileName))
+    mpConfigurationFileWatch = nullptr;
+    if (rFileName.isEmpty() || !QFileInfo::exists(rFileName))
         return;
 
     mpConfigureFunc = pConfigureFunc;