@@ -343,7 +343,12 @@ const HTTPSRules = {
     // applicable rulesets are and aren't active.
     var i = 0;
     var newuri = null
-    var rs = this.potentiallyApplicableRulesets(uri.host);
+    try {
+      var rs = this.potentiallyApplicableRulesets(uri.host);
+    } catch(e) {
+      this.log(WARN, 'Could not check applicable rules for '+uri.spec);
+      return null;
+    }
     if (!alist)
       this.log(DBUG, "No applicable list rewriting " + uri.spec);
     for(i = 0; i < rs.length; ++i) {
 
@@ -306,7 +306,7 @@ HTTPSEverywhere.prototype = {
       var lst = this.getApplicableListForChannel(channel);
       HTTPS.replaceChannel(lst, channel);
     } else if (topic == "http-on-examine-response") {
-      this.log(DBUG, "Got http-on-examine-response @ "+ channel.URI.spec );
+      this.log(DBUG, "Got http-on-examine-response @ "+ (channel.URI ? channel.URI.spec : '') );
       HTTPS.handleSecureCookies(channel);
     } else if (topic == "http-on-examine-merged-response") {
       this.log(DBUG, "Got http-on-examine-merged-response ");