diff --git a/lib/net/sftp/protocol/04/name.rb b/lib/net/sftp/protocol/04/name.rb
index 3e6044d..d27d669 100644
--- a/lib/net/sftp/protocol/04/name.rb
+++ b/lib/net/sftp/protocol/04/name.rb
@@ -38,6 +38,7 @@ def file?
     # used by the unix "ls" utility.
     def longname
       @longname ||= begin
+        permissions = attributes.permissions || 0
         longname = if directory?
           "d"
         elsif symlink?
@@ -46,22 +47,26 @@ def longname
           "-"
         end
 
-        longname << (attributes.permissions & 0400 != 0 ? "r" : "-")
-        longname << (attributes.permissions & 0200 != 0 ? "w" : "-")
-        longname << (attributes.permissions & 0100 != 0 ? "x" : "-")
-        longname << (attributes.permissions & 0040 != 0 ? "r" : "-")
-        longname << (attributes.permissions & 0020 != 0 ? "w" : "-")
-        longname << (attributes.permissions & 0010 != 0 ? "x" : "-")
-        longname << (attributes.permissions & 0004 != 0 ? "r" : "-")
-        longname << (attributes.permissions & 0002 != 0 ? "w" : "-")
-        longname << (attributes.permissions & 0001 != 0 ? "x" : "-")
+        longname << (permissions & 0400 != 0 ? "r" : "-")
+        longname << (permissions & 0200 != 0 ? "w" : "-")
+        longname << (permissions & 0100 != 0 ? "x" : "-")
+        longname << (permissions & 0040 != 0 ? "r" : "-")
+        longname << (permissions & 0020 != 0 ? "w" : "-")
+        longname << (permissions & 0010 != 0 ? "x" : "-")
+        longname << (permissions & 0004 != 0 ? "r" : "-")
+        longname << (permissions & 0002 != 0 ? "w" : "-")
+        longname << (permissions & 0001 != 0 ? "x" : "-")
 
-        longname << (" %-8s %-8s %8d " % [attributes.owner, attributes.group, attributes.size])
+        longname << (" %-8s %-8s %8s " % [attributes.owner, attributes.group, attributes.size || "-"])
 
-        longname << Time.at(attributes.mtime).strftime("%b %e %H:%M ")
+        longname << if attributes.mtime
+          Time.at(attributes.mtime).strftime("%b %e %H:%M ")
+        else
+          " " * 13
+        end
         longname << name
       end
     end
   end
 
-end; end; end; end
\ No newline at end of file
+end; end; end; end
diff --git a/test/protocol/04/test_name.rb b/test/protocol/04/test_name.rb
index c4b1d34..4f9c980 100644
--- a/test/protocol/04/test_name.rb
+++ b/test/protocol/04/test_name.rb
@@ -50,4 +50,13 @@ def test_longname_for_file_should_format_as_file
     assert_equal "-rwxr-xr-x jamis    users       10240 Mar 12 03:40 test",
       @file.longname
   end
+
+  def test_longname_should_tolerate_omitted_optional_attributes
+    sparse = Net::SFTP::Protocol::V04::Name.new(
+      "test",
+      Net::SFTP::Protocol::V04::Attributes.new(:type => 1)
+    )
+
+    assert_equal "----------                          -              test", sparse.longname
+  end
 end