diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index d846055..e74d31a 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -1,5 +1,17 @@
 name: Go
-on: [push]
+on:
+  push:
+    branches:
+      - master
+      - develop
+    paths-ignore:
+      - '*.md'
+  pull_request:
+    branches:
+      - master
+      - develop
+    paths-ignore:
+      - '*.md'
 jobs:
 
   test:
@@ -7,16 +19,17 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: [ '1.11.x', '1.12.x', '1.13.x']
+        go: [ '1.12.x', '1.13.x', '1.14.x']
     steps:
 
     - name: Setup go
       uses: actions/setup-go@v1
       with:
         go-version: ${{ matrix.go }}
+      id: go
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v1
+      uses: actions/checkout@v2
 
     - name: Set GOPATH
       # temporary fix
@@ -26,6 +39,13 @@ jobs:
         echo "##[add-path]$(dirname $GITHUB_WORKSPACE)/bin"
       shell: bash
 
+    - uses: actions/cache@v1
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+
     - name: Get dependencies
       run: | 
         go get -u -v golang.org/x/lint/golint
diff --git a/object/service.go b/object/service.go
index b0afc55..e75c9f2 100644
--- a/object/service.go
+++ b/object/service.go
@@ -124,7 +124,12 @@ func (m *GetResponse) NotFull() bool { return checkIsNotFull(m) }
 func (m *PutRequest) NotFull() bool { return checkIsNotFull(m) }
 
 // CID returns container id value from object put request.
-func (m *PutRequest) CID() CID { return m.GetHeader().Object.SystemHeader.CID }
+func (m *PutRequest) CID() CID {
+	if header := m.GetHeader(); header != nil {
+		return header.Object.SystemHeader.CID
+	}
+	return refs.CID{}
+}
 
 // CID returns container id value from object get request.
 func (m *GetRequest) CID() CID { return m.Address.CID }
diff --git a/object/service_test.go b/object/service_test.go
new file mode 100644
index 0000000..f06e557
--- /dev/null
+++ b/object/service_test.go
@@ -0,0 +1,28 @@
+package object
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestRequest(t *testing.T) {
+	cases := []Request{
+		&PutRequest{},
+		&GetRequest{},
+		&HeadRequest{},
+		&SearchRequest{},
+		&DeleteRequest{},
+		&GetRangeRequest{},
+		&GetRangeHashRequest{},
+	}
+
+	for i := range cases {
+		v := cases[i]
+
+		t.Run(fmt.Sprintf("%T", v), func(t *testing.T) {
+			require.NotPanics(t, func() { v.CID() })
+		})
+	}
+}