After January update it stopped to produce series of rectangles, when the line has some issues in geometry.

[gorwah-debug]

Before updating to 3.1.0 this plugin was handling lines with geometry issues pretty decent. It started at one begining of the line until the points were in order, then it was jumping to the end of line where next point was and was continuing back to the beginning. Now it stops after encountering such geometry issue.

Below warning is thrown:
2026-01-26T09:37:57 WARNING warning:C:\Users/gorwah/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\polystrip\polystripalg.py:83: DeprecationWarning:

         QgsField constructor is deprecated
         
         
         traceback: File "C:\Users/gorwah/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\polystrip\polystrip.py", line 228, in run
          self.dlg.polystrip(layer)
          File "C:\Users/gorwah/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\polystrip\polystripdialog.py", line 97, in polystrip
          return get_all_pages(layer, width, height, srid, coverage, covstart, follow_line_direction)
          File "C:\Users/gorwah/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\polystrip\polystripalg.py", line 83, in get_all_pages
          QgsField("angle", QVariant.Double, len=10, prec=2),

It still works on the same line on version 3.0.1

[gorwah-debug]

debug_line.zip

Example line with issues attached.

[mach0]

hi and thanks for your sample data .. I tried with QGIS 3.44.7 (qt5) and QGIS master (qt6) and there were no error creating the polygons.
And the message you copied is only a Warning - not an error ..
So - sorry - I cannot reproduce your problem.
Which version of QGIS are you using?

[gorwah-debug]

Ok, great to know that the issue should disappear down the line.
For now I am sticking with current LTR 3.40. And keeping PolyStrip on 3,0,1 on other work machine.
I worked around i and just fixed the line and it worked flawlessly, but that was just one road I was working on and it could be a nuisance while working on entire road network ;]

[mach0]

Thanks a lot - I will try again with the LTR version. Maybe I was too optimistic and underestimated the need for LTR support.
Will take a look into it - if you find the problem before me - feel free to create a pull request ;)

[mach0]

Bad news for you: I just tested with
QGIS LTR version 3.40.7-Bratislava
And everything worked without problems with current polystrip 3.0.1 - so I honestly have no clue where your problems do come from. And again - the message you sent is only a deprecation warning and should have nothing to do with creating the polygons.
Are you doing any "own" settings or did you just try to create with the default polystrip settings? (Thats what i did)
And yes - I will take a look into replacing the QgsField function to get rid of the deprecation warning..