A method to detect and diagnose where an error occurs in a source code that is associated with a software program or a website is provided. The method may include receiving a log report associated with the software program or the website, whereby by the log report is sent based on a hidden tag associated with the software program or the website. The method may also include analyzing the received log report. The method may further include detecting at least one error based on the analysis of the received log report. The method may include reverting back to a previous line in the source code associated with the software program or the website, whereby the reverting is based on the detection of the at least one error.