diff --git a/core/misc/ajax.js b/core/misc/ajax.js
index 1734d9f..53712d8 100644
--- a/core/misc/ajax.js
+++ b/core/misc/ajax.js
@@ -104,7 +104,9 @@
     try {
       statusText = "\n" + Drupal.t("StatusText: !statusText", {'!statusText': $.trim(xmlhttp.statusText)});
     }
-    catch (e) {}
+    catch (e) {
+      // Empty.
+    }
 
     responseText = '';
     // Again, we don't have a way to know for sure whether accessing
diff --git a/core/modules/block/js/block.admin.js b/core/modules/block/js/block.admin.js
index 3d8080a..d9e146a 100644
--- a/core/modules/block/js/block.admin.js
+++ b/core/modules/block/js/block.admin.js
@@ -21,7 +21,7 @@
        */
       function hideCategoryDetails (index, element) {
         var $catDetails = $(element);
-        $details.toggle($details.find('li').filter(':visible').length > 0);
+        $catDetails.toggle($catDetails.find('li').filter(':visible').length > 0);
       }
 
       /**
diff --git a/core/modules/node/content_types.js b/core/modules/node/content_types.js
index 5a54d52..8c50715 100644
--- a/core/modules/node/content_types.js
+++ b/core/modules/node/content_types.js
@@ -18,7 +18,7 @@
       });
       $context.find('#edit-workflow').drupalSetSummary(function (context) {
         var vals = [];
-        $(context).find("input[name^='options']")filter(':checked').parent().each(function () {
+        $(context).find("input[name^='options']").filter(':checked').parent().each(function () {
           vals.push(Drupal.checkPlain($(this).text()));
         });
         if (!$(context).find('#edit-options-status').is(':checked')) {