diff --git a/src/common/checksums.cpp b/src/common/checksums.cpp
index 82e64e7053a..76f87288678 100644
--- a/src/common/checksums.cpp
+++ b/src/common/checksums.cpp
@@ -227,6 +227,7 @@ ComputeChecksum::~ComputeChecksum()
 
 void ComputeChecksum::setChecksumType(CheckSums::Algorithm type)
 {
+    Q_ASSERT(type != CheckSums::Algorithm::NONE && type != CheckSums::Algorithm::PARSE_ERROR);
     _checksumType = type;
 }
 
diff --git a/src/gui/folder.cpp b/src/gui/folder.cpp
index 60b8eaf3f21..61938f8596b 100644
--- a/src/gui/folder.cpp
+++ b/src/gui/folder.cpp
@@ -701,7 +701,7 @@ void Folder::slotWatchedPathsChanged(const QSet<QString> &paths, ChangeReason re
                 Q_ASSERT([&] {
                     Q_ASSERT(record.isValid());
                     // we don't intend to burn to many cpu cycles so limit this check on small files
-                    if (!record.isVirtualFile() && record._fileSize < static_cast<qint64>(1_mb)) {
+                    if (!record.isVirtualFile() && record._fileSize < static_cast<qint64>(1_mb) && !record._checksumHeader.isEmpty()) {
                         const auto header = ChecksumHeader::parseChecksumHeader(record._checksumHeader);
                         auto *compute = new ComputeChecksum(this);
                         compute->setChecksumType(header.type());