How to write if statement in table

I'm trying to write an if statement in a table to get one image if an image doesn't exist in the database. Im able to retrieve both images separately but not with the if statement. What am I doing wrong in my code.

<h1>Won Auctions</h1>
<br>

<table class= "table table-hover" >
  <thead>
    <tr>
        <th>Name</th>
        <th>Price</th> 
        <th>End Date</th>
        <th>Seller</th>
        <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% won.each do |a| %>
      <tr>
        <td><%= 
        if a.image.exists? %>
          <%  image_tag(a.image, width:100) %>
        else
          <% image_tag("No_image.jpg", width:100) %>
          <% end %>
         %><td>
        <td><%= a.name %></td>
        <td><%= number_to_currency(a.highest_bid) %></td>
        <td><%= a.auction_end_time %></td>
        <td><%= a.seller.email %></td>

      </tr>
    <% end %>
  </tbody>
</table>

<br>