Suddenly a configuration parsing error

After latest update and restart, KlipperSceen now complains about:

[graph Printer]
extruder = False

2022-09-09 17:41:11,657 [config.py:init()] - Invalid configuration detected !!!
2022-09-09 17:41:11,657 [config.py:init()] - Loading default config

“Expected the number but got: False”