diff --git a/band-plan.html b/band-plan.html
index 43d4a06..ae9b8c7 100644
--- a/band-plan.html
+++ b/band-plan.html
@@ -378,22 +378,30 @@ div>label {
 		}
 
 		function update_inputs() {
-			Promise.all([
+			let urls = [
 				fetch(document.getElementById("base_input").value, {	mode: "cors" }),
-				fetch(document.getElementById("regulation_input").value, {	mode: "cors" }),
-			]).then((res) => {
+			];
+			let reg = document.getElementById("regulation_input").value;
+			if (reg !== "") {
+			  urls.push(fetch(reg, { mode: "cors" }));
+			}
+
+			Promise.all(urls).then((res) => {
 				res.forEach((r) => {
 					if (!r.ok) {
 						throw new Error(r.status);
 					}
 				});
-				Promise.all([res[0].text(), res[1].text()]).then((d) => {
+				let ymls = [res[0].text()];
+				if (reg !== "") {
+					ymls.push(res[1].text());
+				} else {
+				  // make dummy yml file with one big frequency range
+					ymls.push("- header: true\n  columns: []\n  titles: []\n  frequency_unit: GHz\n- frequency: 0-" + 9007199254740991);
+				}
+				Promise.all(ymls).then((d) => {
 					try {
-						let reg = d[1];
-						if (reg === "") {
-							reg = "- header: true\n  columns: []\n  titles: []\n  frequency_unit: GHz\n- frequency: 0-" + 9007199254740991;
-						}
-						update_table(yaml.load(d[0]), yaml.load(reg));
+						update_table(yaml.load(d[0]), yaml.load(d[1]));
 					} catch (e) {
 						display_error(e);
 					}