ROR-simple if else not working

        <% if poll.composite %>
            <td>
              if image-"<%= poll.composite %>"
              <a target="_blank" href="<%= poll.composite %>"><img style="width: 50px" src="<%= poll.composite %>" onerror="this.onerror=null;this.src='assets/img/default.png';" alt=""></a>
            </td>
        <% elsif poll.video.length>0 %>
            <td>
              if video
                <video width="50px" src="<%= poll.video %>" onerror="this.onerror=null;this.src='assets/img/default.png';"></video>
              <a target="_blank" href="<%= poll.composite %>">click here for large view</a>
            </td>
        <% else %>
            <td>
              if nothing
              <img style="width: 50px" src="assets/img/default.png';" onerror="this.onerror=null;this.src='assets/img/default.png';" alt="">
            </td>
        <% end %>

simple if else not working. poll.composite and poll.video can be null in database. but when it goes through it prints if image only.