Can t solve the Broken Reference When Inserting New Values

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// user is logged out
else {
let userId ;
let userEmail ;

// prompt the user to log in  
wixUsers  .  promptLogin ( { "mode" :  "login" } ) 
  . then ( ( user ) => { 
    userId  =  user  .  id ; 
    **return**  user  .  getEmail (); 
  } ) 
  . then ( ( email ) => { 
    // check if there is an item for the user in the collection 
    userEmail  =  email ; 
    **return**  wixData  .  query ( "Members" ) 
      . eq ( "_id" ,  userId ) 
      . find (); 
  } ) 
  . then ( ( results ) => { 
    // if an item for the user is not found 
    **if**  ( results  .  items  .  length  ===  0 ) { 
      // create an item 
      **const**  toInsert  = { 
        "_id" :  userId , 
        "email" :  userEmail 
      }; 
      // add the item to the collection 
      wixData  .  insert ( "Members" ,  toInsert ) 
        . **catch** ( ( err ) => { 
          console . log ( err ); 
        } ); 
    } 
    // update buttons accordingly 
    $w ( "#loginButton" ). label  =  "Logout" ; 
    $w ( "#profileButton" ). show (); 
  } ) 
  . **catch** ( ( err ) => { 
    console  .  log ( err ); 
  } );

}
}