diff --git a/lib/psd/resources/slices.rb b/lib/psd/resources/slices.rb
index 1f34162..205a570 100644
--- a/lib/psd/resources/slices.rb
+++ b/lib/psd/resources/slices.rb
@@ -17,6 +17,8 @@ def parse
           when 7, 8 then
             descriptor_version = @file.read_int
             @data = Descriptor.new(@file).parse
+          else
+            return
           end
 
           normalize_data!