Update template.php

themes/default/template.php

@@ -465,7 +465,7 @@
 										$menu_main_icon = "<span class='glyphicon ".$menu_parent['menu_item_icon']."' title=\"".$menu_parent['menu_language_title']."\"></span>";
 									}
 									else {
-										unset($menu_main_icon);
+										$menu_main_icon = null;
 									}
 									$menu_main_item = "<span class='hidden-sm' style='margin-left: 5px;'>".$menu_parent['menu_language_title']."</span>";
 								}
@@ -496,7 +496,7 @@
 												$menu_sub_icon = "<span class='glyphicon ".$menu_sub['menu_item_icon']."'></span>";
 											}
 											else {
-												unset($menu_sub_icon);
+												$menu_sub_icon = null;
 											}
 										}
 										echo "<li><a href='".$mod_a_2."' ".$mod_a_3.">".(($_SESSION['theme']['menu_sub_icons']) ? "<span class='glyphicon glyphicon-minus visible-xs pull-left' style='margin: 4px 10px 0 25px;'></span>" : null).$menu_sub['menu_language_title'].$menu_sub_icon."</a></li>\n";