diff --git a/examples/server/public/index.html b/examples/server/public/index.html
index 268956abf..6dcdd9c55 100644
--- a/examples/server/public/index.html
+++ b/examples/server/public/index.html
@@ -529,8 +529,9 @@
             alert('Invalid JSON for custom config. Please either fix it or leave it empty.');
             return;
           }
+          console.log(this.config)
           for (const key of CONFIG_NUMERIC_KEYS) {
-            if (!isNaN(this.config[key]) && this.config[key].trim().length > 0) {
+            if (isNaN(this.config[key]) || this.config[key].toString().trim().length === 0) {
               alert(`Invalid number for ${key} (expected an integer or a float)`);
               return;
             }