Exception throwed when no audio header is found within AAC files

Why throw a such exception when the ID3Tag is not an absolute rule in such kind of files?

org.jaudiotagger.audio.exceptions.InvalidAudioFrameException: No audio header found within AAC_8khz_Mono_5.aac
    at org.jaudiotagger.audio.mp3.MP3AudioHeader.<init>(MP3AudioHeader.java:141)
    at org.jaudiotagger.audio.mp3.MP3File.<init>(MP3File.java:478)
    at org.jaudiotagger.audio.mp3.MP3FileReader.read(MP3FileReader.java:39)
    at org.jaudiotagger.audio.AudioFileIO.readFileMagic(AudioFileIO.java:386)
    at org.jaudiotagger.audio.AudioFileIO.readMagic(AudioFileIO.java:178)
    at net.pms.dlna.DLNAMediaInfo.parse(DLNAMediaInfo.java:784)
    at net.pms.dlna.DLNAMediaInfo.generateThumbnail(DLNAMediaInfo.java:579)
    at net.pms.dlna.DLNAResource.checkThumbnail(DLNAResource.java:3552)
    at net.pms.dlna.RealFile.checkThumbnail(RealFile.java:308)
    at net.pms.dlna.RealFile.isValid(RealFile.java:89)
    at net.pms.dlna.DLNAResource.addChild(DLNAResource.java:615)
    at net.pms.dlna.DLNAResource.addChild(DLNAResource.java:581)
    at net.pms.dlna.MapFile.manageFile(MapFile.java:284)
    at net.pms.dlna.MapFile.analyzeChildren(MapFile.java:336)
    at net.pms.dlna.RootFolder.scan(RootFolder.java:272)
    at net.pms.dlna.RootFolder.scan(RootFolder.java:282)
    at net.pms.dlna.RootFolder.scan(RootFolder.java:282)
    at net.pms.dlna.RootFolder.scan(RootFolder.java:228)
    at net.pms.dlna.DLNAMediaDatabase.run(DLNAMediaDatabase.java:952)
    at java.lang.Thread.run(Unknown Source)

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