diff --git a/src/core/FileWatcher.cpp b/src/core/FileWatcher.cpp
index e132b8954..1cf3be8e6 100644
--- a/src/core/FileWatcher.cpp
+++ b/src/core/FileWatcher.cpp
@@ -131,7 +131,7 @@ void FileWatcher::checkFileChanged()
 QByteArray FileWatcher::calculateChecksum()
 {
     QFile file(m_filePath);
-    if (file.open(QFile::ReadOnly)) {
+    if (!m_filePath.isEmpty() && file.open(QFile::ReadOnly)) {
         QCryptographicHash hash(QCryptographicHash::Sha256);
         if (m_fileChecksumSizeBytes > 0) {
             hash.addData(file.read(m_fileChecksumSizeBytes));