#545 Scanning starts but fails at the end on Linux Mint with Samsung SCX-4623F MFP

[Luca]

Hello,
I'm trying to use NAPS on Linux Mint 19.1 Cinnamon, in order to use the scanner of my Samsung SCX-4623F.
The scanner gets recognized, the scan starts and gets to the end of the progress bar, then it exits with the following error:

NAPS2.Scan.Exceptions.ScanDriverUnknownException: An error occurred with the scanning driver. ---> System.Exception: scanimage: rounded value of br-x from 216 to 216
   --- End of inner exception stack trace ---
  at NAPS2.Scan.Sane.SaneWrapper.ThrowDeviceError (System.String stderr) [0x0003d] in <9f6a240cc23c4314a9ab57e06ab812ba>:0 
  at NAPS2.Scan.Sane.SaneWrapper.ScanOne (System.String deviceId, NAPS2.Scan.KeyValueScanOptions options, NAPS2.Util.ProgressHandler progressCallback, System.Threading.CancellationToken cancelToken) [0x0015a] in <9f6a240cc23c4314a9ab57e06ab812ba>:0 
  at NAPS2.Scan.Sane.SaneScanDriver+<>c__DisplayClass14_1.<Transfer>b__1 () [0x00035] in <9f6a240cc23c4314a9ab57e06ab812ba>:0 
  at NAPS2.WinForms.FScanProgress+<<FScanProgress_Shown>b__32_0>d.MoveNext () [0x00023] in <9f6a240cc23c4314a9ab57e06ab812ba>:0 
  at Microsoft.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00042] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0 
  at Microsoft.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccess (System.Threading.Tasks.Task task) [0x0001c] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0 
  at Microsoft.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00009] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0 
  at Microsoft.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0 
  at NAPS2.Scan.ScanDriverBase+<>c__DisplayClass30_0+<<Scan>b__0>d.MoveNext () [0x00073] in <9f6a240cc23c4314a9ab57e06ab812ba>:0 
  at Microsoft.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00042] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0 
  at Microsoft.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccess (System.Threading.Tasks.Task task) [0x0001c] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0 
  at Microsoft.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00009] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0 
  at Microsoft.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0 
  at NAPS2.Scan.ScanPerformer+<PerformScan>d__7.MoveNext () [0x00483] in <9f6a240cc23c4314a9ab57e06ab812ba>:0 

This is the content of the errorlog.txt:

2019-01-10 09:05:01.4034 An error occurred with the scanning driver. System.Exception: scanimage: rounded value of br-x from 216 to 216

Scanning from the command line with scanimage works, but all other sane-based programs fail (they don't even start the scanning even if the scanner gets detected correctly). NAPS2 is the only program that was able to start scanning so far!!
Please help!
Thanks