Use NetBeans Dev 201602080002 for PHP Projects, run x64 version on Win x64.
Have a PHP project with the attached file selenium-api-override.js (which is a part of Selenium IDE 2.9.1).
In Projects navigator, left click at that file selenium-api-override.js. Then Ctrl+F (Search in Projects rather than editor search) and search for the following regex:
In Search Results, you get 'Warnings and Errors':
java.io.IOException: java.lang.IllegalArgumentException: Buffer size <= 0
Bugzilla doesn't allow me to attach an example file (selenium-api-override.js) for this. However, the problem is reproducible with any *empty* file (0 bytes in length).