diff --git a/core/misc/states.js b/core/misc/states.js
index 4f3da8d..ff839b2 100644
--- a/core/misc/states.js
+++ b/core/misc/states.js
@@ -100,6 +100,20 @@
       // The "reference" variable is a comparison function.
       return reference(value);
     },
+    'Array': function (reference, value) {
+      // Make sure value is an array.
+      if (!Array.isArray(value)) {
+        return false;
+      }
+      // We iterate through each value provided in the reference. If all of them
+      // exist in value array, we return true. Otherwise return false.
+      for (var key in reference) {
+        if (reference.hasOwnProperty(key) && value.indexOf(reference[key]) === -1) {
+          return false;
+        }
+      }
+      return true;
+    },
     Number: function (reference, value) {
       // If "reference" is a number and "value" is a string, then cast
       // reference as a string before applying the strict comparison in
@@ -146,7 +160,7 @@
           state = states.State.sanitize(state);
 
           // Initialize the value of this state.
-          this.values[selector][state.name] = null;
+          this.values[selector][state.name] = undefined;
 
           // Monitor state changes of the specified state for this dependee.
           $(selector).on('state:' + state, {selector: selector, state: state}, stateEventHandler);