diff --git a/edit.js b/edit.js
index 230586d9..d05e43a7 100644
--- a/edit.js
+++ b/edit.js
@@ -1265,7 +1265,7 @@ function getSectionsHashes() {
 }
 
 function getMeta(e) {
-	var meta = {};
+	var meta = {urls: [], urlPrefixes: [], domains: [], regexps: []};
 	e.querySelector(".applies-to-list").childNodes.forEach(function(li) {
 		if (li.className == template.appliesToEverything.className) {
 			return;
@@ -1274,7 +1274,7 @@ function getMeta(e) {
 		var value = li.querySelector("[name=applies-value]").value;
 		if (type && value) {
 			var property = CssToProperty[type];
-			meta[property] ? meta[property].push(value) : meta[property] = [value];
+			meta[property].push(value);
 		}
 	});
 	return meta;
diff --git a/storage.js b/storage.js
index 03f4154e..5cd345ee 100644
--- a/storage.js
+++ b/storage.js
@@ -105,6 +105,14 @@ function saveStyle(o, callback) {
 		}).forEach(function(att) {
 			o[att] = null;
 		});
+		// Set other optional things to empty array if they're undefined
+		o.sections.forEach(function(section) {
+			["urls", "urlPrefixes", "domains", "regexps"].forEach(function(property) {
+				if (!section[property]) {
+					section[property] = [];
+				}
+			});
+		});
 		// Set to enabled if not set
 		if (!("enabled" in o)) {
 			o.enabled = true;