Fix crash issue when auto complete the session option.

lib/msf/ui/console/command_dispatcher/core.rb

@@ -2225,8 +2225,10 @@ class Core
   # Provide valid session options for the current post-exploit module
   #
   def option_values_sessions
+    if active_module.respond_to?(:compatible_sessions)
       active_module.compatible_sessions.map { |sid| sid.to_s }
     end
+  end
 
   #
   # Provide valid target options for the current exploit