diff --git a/data/interfaces/default/notifier_config.html b/data/interfaces/default/notifier_config.html
index 03dde272..4f23052f 100644
--- a/data/interfaces/default/notifier_config.html
+++ b/data/interfaces/default/notifier_config.html
@@ -192,6 +192,9 @@
                                 Add custom conditions to only <em>allow certain notifications</em>. By default, all notifications will be sent if there are no conditions.
                                 <a href="#notify-text-sub-modal" data-toggle="modal">Click here</a> for a description of all the parameters.
                             </p>
+                            <p class="help-block">
+                                A tilde (<span class="inline-pre">~</span>) can be entered as a value to indicate a empty string.
+                            </p>
                             <div id="condition-widget"></div>
                             <input type="hidden" id="custom_conditions" name="custom_conditions" />
 
diff --git a/plexpy/notification_handler.py b/plexpy/notification_handler.py
index 97c57993..f8fcd38a 100644
--- a/plexpy/notification_handler.py
+++ b/plexpy/notification_handler.py
@@ -295,7 +295,7 @@ def notify_custom_conditions(notifier_id=None, parameters=None):
             # Cast the condition values to the correct type
             try:
                 if parameter_type == 'str':
-                    values = [str(v).lower() for v in values]
+                    values = ['' if v == '~' else str(v).lower() for v in values]
 
                 elif parameter_type == 'int':
                     values = [helpers.cast_to_int(v) for v in values]