Hi, I just met the situation, when this line of code returns null and causing NPE: https://github.com/apache/jmeter/blob/31c3385075bff2140a4c2b6cdaa2c4a4c1a4a76e/src/core/org/apache/jmeter/services/FileServer.java#L286
fileEntry.headerLine will be non-null only if hasHeader parameter is true. Is this what expected? -- Andrey Pokhilko
