diff --git a/src/Disks/IDisk.h b/src/Disks/IDisk.h
index b2552ec331f0..4d522ff52c57 100644
--- a/src/Disks/IDisk.h
+++ b/src/Disks/IDisk.h
@@ -71,6 +71,7 @@ class Space : public std::enable_shared_from_this<Space>
     virtual const String & getName() const = 0;
 
     /// Reserve the specified number of bytes.
+    /// Returns valid reservation or nullptr when failure.
     virtual ReservationPtr reserve(UInt64 bytes) = 0;
 
     virtual ~Space() = default;
diff --git a/src/Disks/VolumeJBOD.h b/src/Disks/VolumeJBOD.h
index 21d61e6dd8d0..81da64c488d1 100644
--- a/src/Disks/VolumeJBOD.h
+++ b/src/Disks/VolumeJBOD.h
@@ -82,6 +82,9 @@ class VolumeJBOD : public IVolume
         ReservationPtr reserve(uint64_t bytes)
         {
             ReservationPtr reservation = disk->reserve(bytes);
+            if (!reservation)
+                return {};
+
             /// Not just subtract bytes, but update the value,
             /// since some reservations may be done directly via IDisk, or not by ClickHouse.
             free_size = reservation->getUnreservedSpace();