Single predictions list index out of range in foundation.py

After loading a model when conduction single predictions, there is a list index out of range issue. The issue is located in foundation.py file, specifically line 120 (else [self.items[i_] for i_ in i]) which assumes batch input.

Input code:
! [ -e /content ] && pip install -Uqq fastbook
import fastbook
fastbook.setup_book()
from fastai.vision.all import *

learn = load_learner('export.pkl')

learn.predict(img)

Error output:
---------------------------------------------------------------------------
IndexError Traceback (most recent call last)
[](https://localhost:8080/#) in
----> 1 learn.predict(img)

20 frames
[/usr/local/lib/python3.9/dist-packages/fastcore/foundation.py](https://localhost:8080/#) in (.0)
118 return (self.items.iloc[list(i)] if hasattr(self.items,'iloc')
119 else self.items.__array__()[(i,)] if hasattr(self.items,'__array__')
--> 120 else [self.items[i_] for i_ in i])
121
122 def __setitem__(self, idx, o):

IndexError: list index out of range


Start at foundation.py line 120 and reproduce the failure with the provided fastai learner and learn.predict(img) example. Trace how single-item and batch indices reach this list access; done means single predictions no longer raise IndexError while batch indexing still works.

Written by the indexing model from the issue text.