Error Handling is important in a number of ways. It may effect the state of the application, leak system information to a user, the initial failure to cause the error may cause the application be traverse into an insecure state.
Error Handling should be centralised:
When reviewing code it is recommended to assess the commonality within the application from a error/exception handling perspective. Frameworks have error handling resources which can be exploited to assist in secure programming and such resources within the framework should be reviewed to assess if the error handling is "wired-up" correctly.
Actions to take upon an error