zip4j: File name is null, cannot determine file header with exact match for fileName:

Some customers were reporting this issue. For some reason the fileName is sometimes null. Any ideas why this could be happening?

  if (!isStringNotNullAndNotEmpty(fileName)) {
      throw new ZipException("file name is null, cannot determine file header with exact match for fileName: "
          + fileName);
    }

Or is there any way how I could ignore this error?