diff --git a/lib/rex/post/meterpreter/extensions/stdapi/fs/file.rb b/lib/rex/post/meterpreter/extensions/stdapi/fs/file.rb
index 5ec16f86fc..72ab8bfa71 100644
--- a/lib/rex/post/meterpreter/extensions/stdapi/fs/file.rb
+++ b/lib/rex/post/meterpreter/extensions/stdapi/fs/file.rb
@@ -373,7 +373,7 @@ class File < Rex::Post::Meterpreter::Extensions::Stdapi::Fs::IO
     end
 
     # Keep transferring until EOF is reached...
-    block_size = opts['block_size'] || 1024 * 1024
+    block_size = (opts && opts['block_size']) || 1024 * 1024
     begin
       if tries
         # resume when timeouts encountered