diff --git a/lib/settings.js b/lib/settings.js
index 4d350e3..f72051d 100644
--- a/lib/settings.js
+++ b/lib/settings.js
@@ -494,7 +494,8 @@
 				var urlSettings = {};
 
 				(oldStorage.blackList || "").split(",")
-					.filter(function(url){return !!url.trim();})
+					.map(function(url){return url.trim();})
+					.filter(function(url){return !!url;})
 					.forEach(function(url){
 						var entry = urlSettings[url];
 						if (!entry){
@@ -504,7 +505,8 @@
 						}
 					});
 				(oldStorage.whiteList || "").split(",")
-					.filter(function(url){return !!url.trim();})
+					.map(function(url){return url.trim();})
+					.filter(function(url){return !!url;})
 					.forEach(function(url){
 						var entry = urlSettings[url];
 						if (!entry){
@@ -514,7 +516,8 @@
 						}
 					});
 				(oldStorage.ignoreList || "").split(",")
-					.filter(function(url){return !!url.trim();})
+					.map(function(url){return url.trim();})
+					.filter(function(url){return !!url;})
 					.forEach(function(url){
 						var entry = urlSettings[url];
 						if (!entry){