Unable to cope with invalid trkn field (ap shows as 0 of 5127) in mp4 metadata

[IJabz]

Unable to cope with invalid trkn field (ap shows as 0 of 5127) throws

java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
    at java.util.ArrayList.rangeCheck(Unknown Source)
    at java.util.ArrayList.get(Unknown Source)
    at org.jaudiotagger.tag.mp4.field.Mp4TrackField.getTrackNo(Mp4TrackField.java:159)
    at org.jaudiotagger.tag.mp4.Mp4Tag.getFields(Mp4Tag.java:293)
    at org.jaudiotagger.tag.mp4.Mp4Tag.hasField(Mp4Tag.java:243)

Editing this field in iTunes and it can now be read

[IJabz]

Not able to replicate so far, need test file