Encrypting does not complete - divide by zero

[PseudoFIame]

I tried to use this app with a sample picture (square sizes JPEG, each pixel same color; see attached gray.jpg), however the app does not complete. All attempted encryptions fail at around 76%. Clicking on redo takes some time, but fails again.

Tried both v1.01 in F-droid store, as well v1.02 from this repo.

Logs indicate a divide-by-zero problem:

$ adb logcat
...
05-13 05:43:40.156 24616 25288 D JPEG-STEGO: Embedding of 768 bits (92+4 bytes) 
05-13 05:43:40.156 24616 25288 D JPEG-STEGO: using default code, file will not fit
05-13 05:43:43.976 24616 25288 E JPEG-STEGO: java.lang.ArithmeticException: divide by zero
05-13 05:43:43.976 24616 25288 W System.err: java.lang.ArithmeticException: divide by zero
05-13 05:43:43.976 24616 25288 W System.err: 	at info.guardianproject.f5android.plugins.f5.james.JpegEncoder.WriteCompressedData(JpegEncoder.java:592)
05-13 05:43:43.976 24616 25288 W System.err: 	at info.guardianproject.f5android.plugins.f5.james.JpegEncoder.Compress(JpegEncoder.java:101)
05-13 05:43:43.976 24616 25288 W System.err: 	at info.guardianproject.f5android.plugins.f5.james.JpegEncoder.Compress(JpegEncoder.java:126)
05-13 05:43:43.977 24616 25288 W System.err: 	at info.guardianproject.pixelknot.StegoEncryptionJob$3.run(StegoEncryptionJob.java:94)
05-13 05:43:43.977 24616 25288 W System.err: 	at info.guardianproject.pixelknot.StegoJob$1.run(StegoJob.java:79)

sample picture:

[n8fr8]

Thank you for testing and for the sample image. Will reproduce and try to fix.