AttributeError: 'NoneType' object has no attribute 'pop'

[SiTu1O]

Traceback (most recent call last):
File "launch.py", line 295, in
start()
File "launch.py", line 290, in start
webui.webui()
File "/content/stable-diffusion-webui/webui.py", line 133, in webui
initialize()
File "/content/stable-diffusion-webui/webui.py", line 63, in initialize
modules.sd_models.load_model()
File "/content/stable-diffusion-webui/modules/sd_models.py", line 313, in load_model
load_model_weights(sd_model, checkpoint_info)
File "/content/stable-diffusion-webui/modules/sd_models.py", line 196, in load_model_weights
sd = read_state_dict(checkpoint_file)
File "/content/stable-diffusion-webui/modules/sd_models.py", line 178, in read_state_dict
sd = get_state_dict_from_checkpoint(pl_sd)
File "/content/stable-diffusion-webui/modules/sd_models.py", line 152, in get_state_dict_from_checkpoint
pl_sd = pl_sd.pop("state_dict", pl_sd)
AttributeError: 'NoneType' object has no attribute 'pop'

[camenduru]

which notebook is this?