diff --git a/CHANGELOG.md b/CHANGELOG.md
index 98c70b4..0bd16a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+0.4.2
+-----
+
+- Fix NoMethodError bug when params[:_rucaptha] is nil.
+
 0.4.1
 -----
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 2d355e1..f5f7a04 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    rucaptcha (0.4.1)
+    rucaptcha (0.4.2)
       posix-spawn (>= 0.3.0)
 
 GEM
diff --git a/lib/rucaptcha/controller_helpers.rb b/lib/rucaptcha/controller_helpers.rb
index 25ebd0c..78b3d6a 100644
--- a/lib/rucaptcha/controller_helpers.rb
+++ b/lib/rucaptcha/controller_helpers.rb
@@ -15,7 +15,7 @@ module RuCaptcha
 
     def verify_rucaptcha?(resource = nil)
       rucaptcha_at = session[:_rucaptcha_at].to_i
-      captcha = params[:_rucaptcha].downcase.strip
+      captcha = (params[:_rucaptcha] || '').downcase.strip
 
       # Captcha chars in Session expire in 2 minutes
       valid = false
diff --git a/lib/rucaptcha/version.rb b/lib/rucaptcha/version.rb
index 42531f1..2164093 100644
--- a/lib/rucaptcha/version.rb
+++ b/lib/rucaptcha/version.rb
@@ -1,3 +1,3 @@
 module RuCaptcha
-  VERSION = '0.4.1'
+  VERSION = '0.4.2'
 end
diff --git a/spec/controller_helpers_spec.rb b/spec/controller_helpers_spec.rb
index 1a3f2f9..f1fc08b 100644
--- a/spec/controller_helpers_spec.rb
+++ b/spec/controller_helpers_spec.rb
@@ -22,6 +22,19 @@ describe RuCaptcha do
   end
 
   describe '.verify_rucaptcha?' do
+    context 'Nil of param' do
+      it 'should work when params[:_rucaptcha] is nil' do
+        simple.params[:_rucaptcha] = nil
+        expect(simple.verify_rucaptcha?).to eq(false)
+      end
+
+      it 'should work when session[:_rucaptcha] is nil' do
+        simple.session[:_rucaptcha] = nil
+        simple.params[:_rucaptcha] = 'Abcd'
+        expect(simple.verify_rucaptcha?).to eq(false)
+      end
+    end
+
     context 'Correct chars in params' do
       it 'should work' do
         simple.session[:_rucaptcha_at] = Time.now.to_i