In QGIS 3.4.4
When executing plugin

WARNING Traceback (most recent call last):
File "C:/Users/xxx/AppData/Roaming/QGIS/QGIS3\profiles\xxx/python/plugins\polystrip\poly_strip.py", line 191, in run
self.dlg.polystrip(layer)
File "C:/Users/xxx/AppData/Roaming/QGIS/QGIS3\profiles\xxx/python/plugins\polystrip\poly_strip_dialog.py", line 51, in polystrip
getAllPages(layer, width, height, srid, coverage)
File "C:/Users/xxx/AppData/Roaming/QGIS/QGIS3\profiles\xxx/python/plugins\polystrip\poly_strip_alg.py", line 69, in getAllPages
azimuth = startpoint.asPoint().azimuth(endpoint.asPoint())
ValueError: Null geometry cannot be converted to a point.

Im not a programist, I don't know what to do with that.

Hi Werner,
as discussed on the OSGEO mailinglist I wrote a plugin like this about two years ago:

http://osgeo-org.1560.x6.nabble.com/legal-aspects-of-QGIS-plugins-td5311034.html
https://vimeo.com/205947300

In my plugin there are some extras like progress bar and the possibility to select the North-South and East-West orientation of the stripmap polygons. Apart from that I have a second sub-tool to recalculate the angles of the polygons after the user has done his fine-tuning (moving/rotating of stripmap polygons).

If you are interested in having a look at my plugin to use parts of it I can send you the code.

regards,
Thomas

When clicking on OK, apparently nothing happens.
Same thing for OK.
Thanks for checking.

2021-04-23T21:18:50 WARNING Traceback (most recent call last):
File "E:\Portable\QGIS-3.4.11-64bit\qgisconfig\profiles\default/python/plugins\polystrip\poly_strip.py", line 244, in run
self.dlg.polystrip(layer)
File "E:\Portable\QGIS-3.4.11-64bit\qgisconfig\profiles\default/python/plugins\polystrip\poly_strip_dialog.py", line 57, in polystrip
get_all_pages(layer, width, height, srid, coverage, covstart)
File "E:\Portable\QGIS-3.4.11-64bit\qgisconfig\profiles\default/python/plugins\polystrip\poly_strip_alg.py", line 79, in get_all_pages
azimuth = startpoint.asPoint().azimuth(endpoint.asPoint())
ValueError: Null geometry cannot be converted to a point.

Hi;
Great tool! been using it to make map sheets along streets.
Something I noticed is that the last polygon is about 45 degrees off of the strip created by all the other polygons and it doesn't cover the final section of line. I am pretty sure it is the last polygon as defined by the digitized line direction.
Easy fix if you are only doing a few lines at a time, can be an issue if using this on larger numbers.