use qgis processing feedback instead of sys.stdout.write
File "//netfilec.ad.uni-heidelberg.de/home/n/nz385/Anwendungsdaten/QGIS/QGIS3\profiles\default/python/plugins\image_from_tms_tool\utils\get_tiles.py", line 137, in get_tiles sys.stdout.write( AttributeError: 'NoneType' object has no attribute 'write'