title: How can I add unique keys to React/MUI Autocomplete component?
body: <p>I'm trying to create a Material-UI <code>Autocomplete</code> component that essentially just displays search results to the user. Some of the options' names will be duplicates, but they will all have unique IDs. I've been trying to fix the following warning for hours and I can't figure it out.</p>
  <blockquote>
  <p>index.js:1 Warning: Encountered two children with the same key, <code>Name B</code>. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version.</p>
  </blockquote>
  <p>I've tried adding a <code>key={}</code> to numerous places throughout the code, all to no avail.</p>
  <p>Code is attached below, and I'm quite new to this so any suggestions for how to improve the rest of the code generally would also be welcome.</p>
  <pre><code>const SearchField = () =&gt; {
      const [open, setOpen] = React.useState(false)
      const [searchQuery, setSearchQuery] = React.useState('')
      const [searchResults, setSearchResults] = React.useState([])
      const loading = true //later
  
      const debounced = useDebouncedCallback(
          async searchQuery =&gt; {
              if (searchQuery) {
                  let result = await doSearch(searchQuery)
                  if (result.status === 200) {
                      setSearchResults(result.data)
                  } else {
                      console.error(result)
                  }
              }
          },
          1000
      )
  
      const handleInputChange = e =&gt; {
          if (e.target.value &amp;&amp; e.target.value !== searchQuery) {
              debounced(e.target.value)
              setSearchQuery(e.target.value)
          }
      }
  
      const options = [{
          name: 'Name A',
          id: 'entry_0597856'
      },{
          name: 'Name B',
          id: 'entry_3049854'
      },{
          name: 'Name B',
          id: 'entry_3794654'
      },{
          name: 'Name C',
          id: 'entry_9087345'
      }]
  
  
      return (
          &lt;Autocomplete
              id='search_freesolo'
              freeSolo
              selectOnFocus
              clearOnBlur
              handleHomeEndKeys
              autoHighlight
              onInputChange={handleInputChange}
              open={true}
              onOpen={() =&gt; setOpen(true)}
              onClose={() =&gt; setOpen(false)}
              loading={loading}
              key={option =&gt; option.id}
  
              options={options}
              getOptionLabel={option =&gt; option.name}
  
              renderOption={(props, option) =&gt; (
                  &lt;Box
                      component='li'
                      {...props}
                  &gt;
                      {option.name}
                  &lt;/Box&gt;
              )}
  
              renderInput={params =&gt; {
                  return (
                      &lt;TextField
                          {...params}
                          required
                          id=&quot;search_bar&quot;
                          label=&quot;Search&quot;
                          InputProps={{
                              ...params.InputProps,
                              endAdornment: (
                                  &lt;React.Fragment&gt;
                                      {loading ? &lt;CircularProgress size={18} /&gt; : null}
                                      {params.InputProps.endAdornment}
                                  &lt;/React.Fragment&gt;
                              )
                          }}
                      /&gt;
                  )}
              }
              
          /&gt;
      )
  }
  </code></pre>