Don't know, but seems like an odd behavior
I've not set multiSection={true}
My code look like this :
<Autosuggest
suggestions={suggestions}
onSuggestionsFetchRequested={onSuggestionsFetchRequested}
onSuggestionsClearRequested={onSuggestionsClearRequested}
getSuggestionValue={this.getSuggestionValue}
renderSuggestion={renderSuggestion}
onSuggestionSelected={this.onSuggestionSelected}
inputProps={inputProps}
/>
But in the console i have those 2 messages, but i don't need multiSection and even if i set multiSection={false} the error is still the same

Same issue recently needs to be fixed please
Working on it.
As a workaround @thomaslc66, adding "empty" functions on renderSectionTitle and getSectionSuggestions props did the trick for me.
<Autosuggest
...
renderSectionTitle={() => {}}
getSectionSuggestions={() => {}}
/>
tpenaranda's suggestion didn't fix the issue. Even if I put multiSection={false}. No luck. Downgrading to "react-autosuggest": "^9.4.3" fixes the issue for now.
Thanks for contributing @aberezkin.
@tpenaranda Solution worked also, empty functions are the way to go to solve this for now
Fixed in v10.0.2
Most helpful comment
Working on it.