diff --git a/lib/msf/core/db.rb b/lib/msf/core/db.rb
index 32f5cbdd28..a9787fb17b 100644
--- a/lib/msf/core/db.rb
+++ b/lib/msf/core/db.rb
@@ -445,7 +445,7 @@ class DBManager
 			wspace = opts[:workspace] || find_workspace(session.workspace)
 			h_opts = { }
 			h_opts[:host]      = normalize_host(session)
-			h_opts[:arch]      = session.arch if session.arch
+			h_opts[:arch]      = session.arch if session.respond_to?(:arch) and session.arch
 			h_opts[:workspace] = wspace
 			host = find_or_create_host(h_opts)
 			sess_data = {