Fixing icon when editing is no possible when using exercises with a LP

main/exercice/admin.php

@@ -424,7 +424,6 @@ if (isset($exerciseId) && !empty($exerciseId)) {
 	}
 }
 
-
 echo '<div class="actions">';
 if (isset($_GET['hotspotadmin']) || isset($_GET['newQuestion']) || isset($_GET['myid']))
     echo '<a href="admin.php?exerciseId='.$exerciseId.'">'.Display::return_icon('back.png', get_lang('GoBackToQuestionList'),'','32').'</a>';
@@ -433,7 +432,11 @@ if (!isset($_GET['hotspotadmin']) && !isset($_GET['newQuestion']) && !isset($_GE
     echo '<a href="exercice.php?'.api_get_cidReq().'">'.Display::return_icon('back.png', get_lang('BackToExercisesList'),'','32').'</a>';
 }
 echo '<a href="exercice_submit.php?'.api_get_cidreq().'&exerciseId='.$objExercise->id.'">'.Display::return_icon('preview_view.png', get_lang('Preview'),'','32').'</a>';
-echo '<a href="exercise_admin.php?'.api_get_cidreq().'&modifyExercise=yes&exerciseId='.$objExercise->id.'">'.Display::return_icon('settings.png', get_lang('ModifyExercise'),'','32').'</a>';
+if ($show_quiz_edition) {
+    echo '<a href="exercise_admin.php?'.api_get_cidreq().'&modifyExercise=yes&exerciseId='.$objExercise->id.'">'.Display::return_icon('settings.png', get_lang('ModifyExercise'),'','32').'</a>';
+} else {
+    echo '<a href="">'.Display::return_icon('settings_na.png', get_lang('ModifyExercise'),'','32').'</a>';
+}
 
 echo '</div>';