diff --git a/README.md b/README.md
index 726954b..1213b1c 100644
--- a/README.md
+++ b/README.md
@@ -112,6 +112,8 @@ enabled = true
 min_length = 8
 ; Min. number of uppercase characters
 upper = 1
+; Min. number of lowercase characters
+lower = 0
 ; Min. number of numbers
 number = 1
 ; Min. number of special characters
diff --git a/data/config-default.ini b/data/config-default.ini
index 59625de..47f0a53 100644
--- a/data/config-default.ini
+++ b/data/config-default.ini
@@ -31,6 +31,8 @@ enabled = true
 min_length = 8
 ; Min. number of uppercase characters
 upper = 1
+; Min. number of lowercase characters
+lower = 0
 ; Min. number of numbers
 number = 1
 ; Min. number of special characters
diff --git a/data/templates/form.html b/data/templates/form.html
index 784501b..a1d4298 100644
--- a/data/templates/form.html
+++ b/data/templates/form.html
@@ -141,16 +141,18 @@
                             for (var key in data) {
                                 if (data.hasOwnProperty(key)) {
                                     var criterion = document.getElementById(key);
-                                    if (data[key] == false) {
-                                        valid = false;
-                                        if (criterion.classList.contains('list-group-item-success')) {
-                                            criterion.classList.remove('list-group-item-success');
-                                            criterion.classList.add('list-group-item-danger');
-                                        };
-                                    } else {
-                                        if (criterion.classList.contains('list-group-item-danger')) {
-                                            criterion.classList.remove('list-group-item-danger');
-                                            criterion.classList.add('list-group-item-success');
+                                    if (criterion) {
+                                        if (data[key] == false) {
+                                            valid = false;
+                                            if (criterion.classList.contains('list-group-item-success')) {
+                                                criterion.classList.remove('list-group-item-success');
+                                                criterion.classList.add('list-group-item-danger');
+                                            };
+                                        } else {
+                                            if (criterion.classList.contains('list-group-item-danger')) {
+                                                criterion.classList.remove('list-group-item-danger');
+                                                criterion.classList.add('list-group-item-success');
+                                            };
                                         };
                                     };
                                 };
diff --git a/jellyfin_accounts/validate_password.py b/jellyfin_accounts/validate_password.py
index 953485e..eb166cf 100644
--- a/jellyfin_accounts/validate_password.py
+++ b/jellyfin_accounts/validate_password.py
@@ -2,20 +2,24 @@ specials = ['[', '@', '_', '!', '#', '$', '%', '^', '&', '*', '(', ')',
             '<', '>', '?', '/', '\\', '|', '}', '{', '~', ':', ']']
 
 class PasswordValidator:
-    def __init__(self, min_length, upper, number, special):
+    def __init__(self, min_length, upper, lower, number, special):
         self.criteria = {'characters': int(min_length),
                          'uppercase characters': int(upper),
+                         'lowercase characters': int(lower),
                          'numbers': int(number),
                          'special characters': int(special)}
     def validate(self, password):
         count = {'characters': 0,
                  'uppercase characters': 0,
+                 'lowercase characters': 0,
                  'numbers': 0,
                  'special characters': 0}
         for c in password:
             count['characters'] += 1
             if c.isupper():
                 count['uppercase characters'] += 1
+            elif c.islower():
+                count['lowercase characters'] += 1
             elif c.isnumeric():
                 count['numbers'] += 1
             elif c in specials:
diff --git a/jellyfin_accounts/web_api.py b/jellyfin_accounts/web_api.py
index 2b581a7..1ea249b 100644
--- a/jellyfin_accounts/web_api.py
+++ b/jellyfin_accounts/web_api.py
@@ -69,10 +69,11 @@ while attempts != 3:
 if config.getboolean('password_validation', 'enabled'):
     validator = PasswordValidator(config['password_validation']['min_length'],
                                   config['password_validation']['upper'],
+                                  config['password_validation']['lower'],
                                   config['password_validation']['number'],
                                   config['password_validation']['special'])
 else:
-    validator = PasswordValidator(0, 0, 0, 0)
+    validator = PasswordValidator(0, 0, 0, 0, 0)
 
 
 @app.route('/getRequirements', methods=['GET', 'POST'])