Only variables should be passed by reference

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I used wordpress 4.7.2 and PHP 7.1.2
I received error
Notice: Only variables should be passed by reference in /wp-content/plugins/wp-config-file-editor/Installer/Installer.class.php on line 117

Notice: Only variables should be passed by reference in /wp-content/plugins/wp-config-file-editor/Libraries/InstallerService.abstract.php on line 49