diff --git a/src/common/Routing.ts b/src/common/Routing.ts
index d246adc..cbe6e07 100644
--- a/src/common/Routing.ts
+++ b/src/common/Routing.ts
@@ -1,4 +1,4 @@
-export type RouteParams = { [p: string]: string | number } | string[] | string | number;
+export type RouteParams = { [p: string]: string | number | undefined } | string[] | string | number;
 export type QueryParamsRecord = Record<string, string | number | boolean | null | undefined>;
 export type QueryParams = string[][] | QueryParamsRecord | string | URLSearchParams;
 
@@ -43,7 +43,10 @@ export function route(
         path = path.replace(/\/+/g, '/');
     } else {
         for (const key of Object.keys(params)) {
-            path = path.replace(getRouteParamRegExp(key), params[key].toString());
+            const paramValue = params[key];
+            if (paramValue) {
+                path = path.replace(getRouteParamRegExp(key), paramValue.toString());
+            }
         }
     }