diff --git a/core/misc/states.js b/core/misc/states.js
index b007b70..e61e1bd 100644
--- a/core/misc/states.js
+++ b/core/misc/states.js
@@ -159,6 +159,9 @@
 
           state = states.State.sanitize(state);
 
+          // Initialize the value of this state.
+          this.values[selector][state.name] = null;
+
           // Monitor state changes of the specified state for this dependee.
           $(selector).on('state:' + state, {selector: selector, state: state}, stateEventHandler);