diff --git a/drivers/filesystems/udfs/udf_info/dirtree.cpp b/drivers/filesystems/udfs/udf_info/dirtree.cpp
index e4ed3534956e4..fea350ca82c9a 100644
--- a/drivers/filesystems/udfs/udf_info/dirtree.cpp
+++ b/drivers/filesystems/udfs/udf_info/dirtree.cpp
@@ -398,9 +398,11 @@ UDFBuildHashEntry(
         UName.MaximumLength = Name->Length;
         UName.Buffer = (PWCHAR)FsRtlAllocatePoolWithTag(NonPagedPool, UName.MaximumLength, TAG_FILE_NAME);
 
-        RtlUpcaseUnicodeString(&UName, Name, FALSE);
-        hashes->hLfn = crc32((uint8*)(UName.Buffer), UName.Length);
-        ExFreePoolWithTag(UName.Buffer, TAG_FILE_NAME);
+        if (UName.Buffer) {
+            RtlUpcaseUnicodeString(&UName, Name, FALSE);
+            hashes->hLfn = crc32((uint8*)(UName.Buffer), UName.Length);
+            ExFreePoolWithTag(UName.Buffer, TAG_FILE_NAME);
+        }
     }
 
     if (Mask & HASH_DOS) {