diff --git a/main/src/com/google/refine/ProjectManager.java b/main/src/com/google/refine/ProjectManager.java
index 42ab4d168..9a046ea34 100644
--- a/main/src/com/google/refine/ProjectManager.java
+++ b/main/src/com/google/refine/ProjectManager.java
@@ -132,13 +132,14 @@ public abstract class ProjectManager {
             _projectsMetadata.put(project.id, projectMetadata);
             if (_projectsTags == null)
                 _projectsTags = new HashMap<String, Integer>();
-
-            for (String tag : projectMetadata.getTags()) {
-              if (_projectsTags.containsKey(tag)) {
-                _projectsTags.put(tag, _projectsTags.get(tag) + 1);
-              } else {
-                  _projectsTags.put(tag, 1);
-              }
+            if(projectMetadata.getTags()!=null) {
+              for (String tag : projectMetadata.getTags()) {
+                  if (_projectsTags.containsKey(tag)) {
+                    _projectsTags.put(tag, _projectsTags.get(tag) + 1);
+                  } else {
+                      _projectsTags.put(tag, 1);
+                  }
+                }
             }
         }
     }
diff --git a/main/webapp/modules/core/scripts/index/default-importing-controller/controller.js b/main/webapp/modules/core/scripts/index/default-importing-controller/controller.js
index 1b50fdd8c..3cc466e39 100644
--- a/main/webapp/modules/core/scripts/index/default-importing-controller/controller.js
+++ b/main/webapp/modules/core/scripts/index/default-importing-controller/controller.js
@@ -342,7 +342,7 @@ Refine.TagsManager.allProjectTags = [];
 
 Refine.TagsManager._getAllProjectTags = function() {
     var self = this;
-    if (self.allProjectTags.length == 0) {
+    if (self.allProjectTags.length === 0) {
         jQuery.ajax({
              url : "command/core/get-all-project-tags",
              success : function(result) {
diff --git a/main/webapp/modules/core/scripts/index/open-project-ui.js b/main/webapp/modules/core/scripts/index/open-project-ui.js
index ea929cb5f..5593dbf4e 100644
--- a/main/webapp/modules/core/scripts/index/open-project-ui.js
+++ b/main/webapp/modules/core/scripts/index/open-project-ui.js
@@ -282,8 +282,8 @@ Refine.OpenProjectUI.prototype._renderProjects = function(data) {
     
     $(tr.insertCell(tr.cells.length));
     var tags = project.tags;
-    for (var i = 0; i < tags.length; i++) {
-        var tag = tags[i];
+    for (var index = 0; index < tags.length; index++) {
+        var tag = tags[index];
         $("<span/>")
         .addClass("project-tag")
         .text(tag)
@@ -304,7 +304,7 @@ Refine.OpenProjectUI.prototype._renderProjects = function(data) {
     .click(function() {
             var oldTags = project.tags.join(",");
             var newTags = window.prompt($.i18n._('core-index-open')["edit-tags-desc"],oldTags);
-            if (newTags === null || newTags == oldTags) {
+            if (newTags === null || newTags === oldTags) {
                 return false;
             }
             $.ajax({
diff --git a/main/webapp/modules/core/scripts/util/filter-lists.js b/main/webapp/modules/core/scripts/util/filter-lists.js
index c7103bdd1..33fa3e606 100644
--- a/main/webapp/modules/core/scripts/util/filter-lists.js
+++ b/main/webapp/modules/core/scripts/util/filter-lists.js
@@ -29,7 +29,7 @@
         
                 /* FILTERPORTFOLIO: pass in a class to show, all others will be hidden */
                 listElement.bind("filterMyList", function( e, classToShow ){
-                        if(classToShow == settings.allTag){
+                        if(classToShow === settings.allTag){
                                 $(this).trigger("show");
                         }else{
                                 $(this).trigger("show", [ '.' + classToShow ] );