diff --git a/index.html b/index.html
index 6453976a..a1e0dbf9 100644
--- a/index.html
+++ b/index.html
@@ -8190,7 +8190,7 @@
     <script src="modules/cultures-generator.js?v=1.99.00"></script>
     <script src="modules/renderers/state-labels.js?v=1.96.04"></script>
     <script src="modules/burgs-and-states.js?v=1.99.00"></script>
-    <script src="modules/routes-generator.js?v=1.99.00"></script>
+    <script src="modules/routes-generator.js?v=1.99.02"></script>
     <script src="modules/religions-generator.js?v=1.99.00"></script>
     <script src="modules/military-generator.js?v=1.99.00"></script>
     <script src="modules/markers-generator.js?v=1.99.00"></script>
@@ -8219,8 +8219,8 @@
     <script defer src="modules/ui/namesbase-editor.js?v=1.99.00"></script>
     <script defer src="modules/ui/elevation-profile.js?v=1.99.00"></script>
     <script defer src="modules/ui/temperature-graph.js?v=1.99.00"></script>
-    <script defer src="modules/ui/routes-editor.js?v=1.99.00"></script>
-    <script defer src="modules/ui/routes-creator.js?v=1.99.00"></script>
+    <script defer src="modules/ui/routes-editor.js?v=1.99.02"></script>
+    <script defer src="modules/ui/routes-creator.js?v=1.99.02"></script>
     <script defer src="modules/ui/route-group-editor.js?v=1.99.00"></script>
     <script defer src="modules/ui/ice-editor.js?v=1.99.00"></script>
     <script defer src="modules/ui/lakes-editor.js?v=1.99.00"></script>
@@ -8235,7 +8235,7 @@
     <script defer src="modules/ui/diplomacy-editor.js?v=1.99.00"></script>
     <script defer src="modules/ui/zones-editor.js?v=1.99.00"></script>
     <script defer src="modules/ui/burgs-overview.js?v=1.99.00"></script>
-    <script defer src="modules/ui/routes-overview.js?v=1.99.00"></script>
+    <script defer src="modules/ui/routes-overview.js?v=1.99.02"></script>
     <script defer src="modules/ui/rivers-overview.js?v=1.99.00"></script>
     <script defer src="modules/ui/military-overview.js?v=1.99.00"></script>
     <script defer src="modules/ui/regiments-overview.js?v=1.99.00"></script>
diff --git a/modules/routes-generator.js b/modules/routes-generator.js
index 376e9d03..3a79e69a 100644
--- a/modules/routes-generator.js
+++ b/modules/routes-generator.js
@@ -434,7 +434,7 @@ window.Routes = (function () {
     const points = getPoints("trails", pathCells, pointsArray);
     const feature = cells.f[cellId];
 
-    const routeId = Math.max(...routes.map(route => route.i)) + 1;
+    const routeId = getNextId();
     const newRoute = {i: routeId, group: "trails", feature, points};
     routes.push(newRoute);
 
@@ -706,6 +706,10 @@ window.Routes = (function () {
     return path.getTotalLength();
   }
 
+  function getNextId() {
+    return pack.routes.length ? Math.max(...pack.routes.map(r => r.i)) + 1 : 0;
+  }
+
   function remove(route) {
     const routes = pack.cells.routes;
 
@@ -738,6 +742,7 @@ window.Routes = (function () {
     generateName,
     getPath,
     getLength,
+    getNextId,
     remove
   };
 })();
diff --git a/modules/ui/routes-creator.js b/modules/ui/routes-creator.js
index cd9d853f..3e2d6620 100644
--- a/modules/ui/routes-creator.js
+++ b/modules/ui/routes-creator.js
@@ -97,7 +97,7 @@ function createRoute(defaultGroup) {
     const points = createRoute.points;
     if (points.length < 2) return tip("Add at least 2 points", false, "error");
 
-    const routeId = Math.max(...pack.routes.map(route => route.i)) + 1;
+    const routeId = Routes.getNextId();
     const group = byId("routeCreatorGroupSelect").value;
     const feature = pack.cells.f[points[0][2]];
     const route = {points, group, feature, i: routeId};
diff --git a/modules/ui/routes-editor.js b/modules/ui/routes-editor.js
index 3a137623..82f13e44 100644
--- a/modules/ui/routes-editor.js
+++ b/modules/ui/routes-editor.js
@@ -194,7 +194,7 @@ function editRoute(id) {
 
       // create new route
       const newRoute = {
-        i: Math.max(...pack.routes.map(route => route.i)) + 1,
+        i: Routes.getNextId(),
         group: route.group,
         feature: route.feature,
         name: route.name,
diff --git a/modules/ui/routes-overview.js b/modules/ui/routes-overview.js
index d9817dc3..3a8cc5fa 100644
--- a/modules/ui/routes-overview.js
+++ b/modules/ui/routes-overview.js
@@ -58,7 +58,7 @@ function overviewRoutes() {
 
     // update footer
     routesFooterNumber.innerHTML = pack.routes.length;
-    const averageLength = rn(d3.mean(pack.routes.map(r => r.length)));
+    const averageLength = rn(d3.mean(pack.routes.map(r => r.length)) || 0);
     routesFooterLength.innerHTML = averageLength * distanceScale + " " + distanceUnitInput.value;
 
     // add listeners
@@ -175,8 +175,8 @@ function overviewRoutes() {
           pack.routes = [];
           routes.selectAll("path").remove();
 
+          routesOverviewAddLines();
           $(this).dialog("close");
-          $("#routesOverview").dialog("close");
         },
         Cancel: function () {
           $(this).dialog("close");
diff --git a/versioning.js b/versioning.js
index 4bee932e..30c5eedb 100644
--- a/versioning.js
+++ b/versioning.js
@@ -1,7 +1,7 @@
 "use strict";
 
 // version and caching control
-const version = "1.99.01"; // generator version, update each time
+const version = "1.99.02"; // generator version, update each time
 
 {
   document.title += " v" + version;