diff --git a/lib/FileSystemInfo.js b/lib/FileSystemInfo.js
index 87221acfa..4aa05b3bf 100644
--- a/lib/FileSystemInfo.js
+++ b/lib/FileSystemInfo.js
@@ -2565,6 +2565,7 @@ class FileSystemInfo {
 				}
 				if (
 					snap.timestampHash !== undefined &&
+					current.timestampHash !== undefined &&
 					current.timestampHash !== snap.timestampHash
 				) {
 					// If we have a timestampHash (it was a directory) and it differs from current timestampHash