diff --git a/src/lib/utility/TimePoint.cpp b/src/lib/utility/TimePoint.cpp
index e91f8046..e7554b9a 100644
--- a/src/lib/utility/TimePoint.cpp
+++ b/src/lib/utility/TimePoint.cpp
@@ -24,6 +24,11 @@ TimePoint::TimePoint(std::string s)
 	}
 }
 
+bool TimePoint::isValid() const
+{
+	return m_time != boost::posix_time::not_a_date_time;
+}
+
 std::string TimePoint::toString() const
 {
 	std::stringstream stream;
diff --git a/src/lib/utility/TimePoint.h b/src/lib/utility/TimePoint.h
index b0acf6e0..12edef2b 100644
--- a/src/lib/utility/TimePoint.h
+++ b/src/lib/utility/TimePoint.h
@@ -11,6 +11,8 @@ public:
 	//TimePoint(time_t t);
 	TimePoint(std::string s);
 
+	bool isValid() const;
+
 	std::string toString() const;
 
 	inline bool operator==(const TimePoint& rhs){ return m_time == rhs.m_time; }
diff --git a/src/lib_gui/qt/element/QtCodeFile.cpp b/src/lib_gui/qt/element/QtCodeFile.cpp
index a5266d81..eb91c1dc 100644
--- a/src/lib_gui/qt/element/QtCodeFile.cpp
+++ b/src/lib_gui/qt/element/QtCodeFile.cpp
@@ -111,8 +111,11 @@ QtCodeFile::~QtCodeFile()
 
 void QtCodeFile::setModificationTime(TimePoint modificationTime)
 {
-	m_modificationTime = modificationTime;
-	updateTitleBar();
+	if (modificationTime.isValid())
+	{
+		m_modificationTime = modificationTime;
+		updateTitleBar();
+	}
 }
 
 const FilePath& QtCodeFile::getFilePath() const