Selecting the placeholder item causes a crash/duplicate placeholder items

Describe the bug
The app crashes if you select the placeholder item after selecting another item.

This occurs regardless of whether a placeholder is provided.

Adding an item object with value: null results in duplicate placeholder items appearing in the dropdown.

To Reproduce

Crash

1. Select a non-placeholder item
2. Select the placeholder item
3. See error: TypeError: TypeError: Cannot read property 'label' of undefined.

1. Add an item object with a value of null to the items array.

Expected behaviour
The placeholder item should just be selected. There should only be one placeholder item.

Screenshots
See below.

Smartphone (please complete the following information):

• Device: Samsung S6
• OS: Android 7.0
• react-native-picker-select version: 6.0.0
• react-native version: 0.55
• react version: 16.3.1

Reproduction and/or code sample

Crash

      const items = [
           {
              label: 'Packed By Owner',
              value: 'packed_owner'
           }
       ]
      <RNPickerSelect
        items={items}
        onValueChange={onChange}
        value={value}
      />

Duplicate placeholders

const items = [
           {
               label: 'Select items...',
               value: null
           },
           {
              label: 'Packed By Owner',
              value: 'packed_owner'
           }
       ]

[ylac]

Can’t repro, closing thanks.

[ArturCherkanov]

I faced with the same problem, I downgraded react native version to 0.63.0, it resolved the problem