Help understanding error message

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I keep getting this error message on the backend whenever I go to the plugins tab. The message reads, “**Warning**: Undefined property: stdClass::$plugin in **/Users/NAME/Local Sites/SITENAME/app/public/wp-includes/class-wp-list-util.php** on line **168”**

Line 168 in that file is this: 

$newlist[ $key ] = $value->$field;

The whole block is as follows:

if ( ! $index_key ) {
            /*
             * This is simple. Could at some point wrap array_column()
             * if we knew we had an array of arrays.
             */
            foreach ( $this->output as $key => $value ) {
                if ( is_object( $value ) ) {
                    $newlist[ $key ] = $value->$field;
                } elseif ( is_array( $value ) ) {
                    $newlist[ $key ] = $value[ $field ];
                } else {
                    _doing_it_wrong(
                        __METHOD__,
                        __( ‘Values for the input array must be either objects or arrays.’ ),
                        ‘6.2.0’
                    );
                }
            }

Can anyone help me identify what the issue is? 

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