What is the "SQLite3::SQLException" error?

Question

Ruby on Rails

(25.7ms)  commit transaction                                                                                                                                                                              
  Rendered sync/mentions/_post_mention.html.erb (0.6ms)                                                                                                                                                      
   (0.3ms)  rollback transaction                                                                                                                                                                             
SQLite3::SQLException: cannot rollback - no transaction is active: rollback transaction                                                                                                                      
Completed 500 Internal Server Error in 83ms                                                                                                                                                                  
                                                                                                                                                                                                             
ActiveRecord::StatementInvalid (SQLite3::SQLException: cannot rollback - no transaction is active: rollback transaction):                                                                                    
  app/controllers/mentions_controller.rb:37:in `block in create'                                                                                                                                             
  app/controllers/mentions_controller.rb:36:in `create'

Answer 1

trying to rollback a non-existing transaction