diff --git a/app/models/notice.rb b/app/models/notice.rb
index 4cca6d8..5be37d7 100644
--- a/app/models/notice.rb
+++ b/app/models/notice.rb
@@ -94,7 +94,8 @@ class Notice
   end
 
   def env_vars
-    request['cgi-data'] || {}
+    vars = request['cgi-data']
+    vars.is_a?(Hash) ? vars : {}
   end
 
   def params
diff --git a/spec/models/notice_spec.rb b/spec/models/notice_spec.rb
index a3bacdb..ead86f5 100644
--- a/spec/models/notice_spec.rb
+++ b/spec/models/notice_spec.rb
@@ -105,4 +105,18 @@ describe Notice, type: 'model' do
       expect(notice.request).to eq ({})
     end
   end
+
+  describe "env_vars" do
+    it "returns the cgi-data" do
+      notice = Notice.new
+      notice.request = { 'cgi-data' => { 'ONE' => 'TWO' } }
+      expect(notice.env_vars).to eq({ 'ONE' => 'TWO' })
+    end
+
+    it "always returns a hash" do
+      notice = Notice.new
+      notice.request = { 'cgi-data' => [] }
+      expect(notice.env_vars).to eq({})
+    end
+  end
 end
--
libgit2 0.21.2