Text files should end with a valid new line character.

More information: https://insight.symfony.com/what-we-analyse/missing_e_o_l

in templates/data_collector/template.html.twig, line 84 
  1.                 </tr>

  2.             {% endfor %}

  3.         </table>

  4.     {% endfor %}

  5. {% endblock %}

  6. This file ends with no newline character, or with a different newline character than other files in your project. It won't render properly on a terminal, and it's considered a bad practice.
    Time to fix: about 15 minutes
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    Collective