https://github.com/NodeBB/NodeBB/issues/4167

templates/partials/menu.tpl

@@ -175,7 +175,7 @@
 					<!-- BEGIN navigation -->
 					<!-- IF function.displayMenuItem, @index -->
 					<li class="{navigation.class}">
-						<a href="{relative_path}{navigation.route}" title="{navigation.title}" <!-- IF navigation.id -->id="{navigation.id}"<!-- ENDIF navigation.id --><!-- IF navigation.properties.targetBlank --> target="_blank"<!-- ENDIF navigation.properties.targetBlank -->>
+						<a href="{navigation.route}" title="{navigation.title}" <!-- IF navigation.id -->id="{navigation.id}"<!-- ENDIF navigation.id --><!-- IF navigation.properties.targetBlank --> target="_blank"<!-- ENDIF navigation.properties.targetBlank -->>
 							<!-- IF navigation.iconClass -->
 							<i class="fa fa-fw {navigation.iconClass}"></i>
 							<!-- ENDIF navigation.iconClass -->