tile band becomes None type

[ninsbl]

Maybe a corner case, but for a mainly black map canvas the following error pops up:

Traceback (most recent call last):
File "C:/Users/stefan.blumentrath/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\GarminCustomMap\GarminCustomMap.py", line 551, in run
if t_band_1.min() == 255 and t_band_2.min() == 255 and t_band_3.min() == 255 :
AttributeError: 'NoneType' object has no attribute 'min'

[ghtmtt]

Do you think a QgsMessageBar is enough to inform the user about this corner case?

[ninsbl]

Do you think a QgsMessageBar is enough to inform the user about this corner case?
Yes, that would be absolut sufficient.
However, on a second thought, the reason for the error message can also be that mapcanvas settings got messed up when I tried to replicate #8 and the process exited premature. Maybe an improved atexit procedure would be needed in the long run...

[jwidness]

I'm getting the same NoneType error and my canvas isn't mostly black.

[kellerbaum]

Same error. In my case i converted was changing crs from what the layer was created in to WGS 84 to send to garmin. Created the layer in wgs 84 solved in my case.