diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 2ed4f1521..c0793a4bf 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -458,9 +458,9 @@ class ApplicationController < ActionController::Base
   # Returns the API key present in the request
   def api_key_from_request
     if params[:key].present?
-      params[:key]
+      params[:key].to_s
     elsif request.headers["X-Redmine-API-Key"].present?
-      request.headers["X-Redmine-API-Key"]
+      request.headers["X-Redmine-API-Key"].to_s
     end
   end
 
diff --git a/app/models/user.rb b/app/models/user.rb
index b11d91807..e116d0cec 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -130,8 +130,11 @@ class User < Principal
 
   # Returns the user that matches provided login and password, or nil
   def self.try_to_login(login, password)
+    login = login.to_s
+    password = password.to_s
+
     # Make sure no one can sign in with an empty password
-    return nil if password.to_s.empty?
+    return nil if password.empty?
     user = find_by_login(login)
     if user
       # user is already in local database
@@ -164,7 +167,7 @@ class User < Principal
 
   # Returns the user who matches the given autologin +key+ or nil
   def self.try_to_autologin(key)
-    tokens = Token.find_all_by_action_and_value('autologin', key)
+    tokens = Token.find_all_by_action_and_value('autologin', key.to_s)
     # Make sure there's only 1 token that matches the key
     if tokens.size == 1
       token = tokens.first
@@ -338,12 +341,12 @@ class User < Principal
   end
 
   def self.find_by_rss_key(key)
-    token = Token.find_by_value(key)
+    token = Token.find_by_action_and_value('feeds', key.to_s)
     token && token.user.active? ? token.user : nil
   end
 
   def self.find_by_api_key(key)
-    token = Token.find_by_action_and_value('api', key)
+    token = Token.find_by_action_and_value('api', key.to_s)
     token && token.user.active? ? token.user : nil
   end