diff --git a/backend/plugins/github/tasks/pr_collector.go b/backend/plugins/github/tasks/pr_collector.go
index 05ca03beedc..9c90470ec52 100644
--- a/backend/plugins/github/tasks/pr_collector.go
+++ b/backend/plugins/github/tasks/pr_collector.go
@@ -129,6 +129,7 @@ func CollectApiPullRequests(taskCtx plugin.SubTaskContext) errors.Error {
 					res.Body.Close()
 					return []json.RawMessage{body}, nil
 				},
+				AfterResponse: ignoreHTTPStatus404,
 			},
 		},
 	})
diff --git a/backend/plugins/github/tasks/shared_test.go b/backend/plugins/github/tasks/shared_test.go
new file mode 100644
index 00000000000..8bcb4249e58
--- /dev/null
+++ b/backend/plugins/github/tasks/shared_test.go
@@ -0,0 +1,126 @@
+/*
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You under the Apache License, Version 2.0
+(the "License"); you may not use this file except in compliance with
+the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package tasks
+
+import (
+	"bytes"
+	"io"
+	"net/http"
+	"testing"
+
+	"github.com/apache/devlake/core/errors"
+	"github.com/apache/devlake/helpers/pluginhelper/api"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func makeTestResponse(statusCode int) *http.Response {
+	return &http.Response{
+		StatusCode: statusCode,
+		Body:       io.NopCloser(bytes.NewBufferString("")),
+		Request:    &http.Request{},
+	}
+}
+
+func TestIgnoreHTTPStatus404(t *testing.T) {
+	tests := []struct {
+		name       string
+		statusCode int
+		wantIgnore bool
+		wantUnauth bool
+		wantNil    bool
+	}{
+		{
+			name:       "404 returns ErrIgnoreAndContinue",
+			statusCode: http.StatusNotFound,
+			wantIgnore: true,
+		},
+		{
+			name:       "401 returns unauthorized error",
+			statusCode: http.StatusUnauthorized,
+			wantUnauth: true,
+		},
+		{
+			name:       "200 returns nil",
+			statusCode: http.StatusOK,
+			wantNil:    true,
+		},
+		{
+			name:       "403 returns nil",
+			statusCode: http.StatusForbidden,
+			wantNil:    true,
+		},
+		{
+			name:       "500 returns nil",
+			statusCode: http.StatusInternalServerError,
+			wantNil:    true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			res := makeTestResponse(tt.statusCode)
+			err := ignoreHTTPStatus404(res)
+			if tt.wantIgnore {
+				assert.Equal(t, api.ErrIgnoreAndContinue, err)
+			} else if tt.wantUnauth {
+				require.NotNil(t, err)
+				assert.Equal(t, errors.Unauthorized, err.GetType())
+			} else if tt.wantNil {
+				assert.Nil(t, err)
+			}
+		})
+	}
+}
+
+func TestIgnoreHTTPStatus422(t *testing.T) {
+	tests := []struct {
+		name       string
+		statusCode int
+		wantIgnore bool
+		wantNil    bool
+	}{
+		{
+			name:       "422 returns ErrIgnoreAndContinue",
+			statusCode: http.StatusUnprocessableEntity,
+			wantIgnore: true,
+		},
+		{
+			name:       "200 returns nil",
+			statusCode: http.StatusOK,
+			wantNil:    true,
+		},
+		{
+			name:       "404 returns nil",
+			statusCode: http.StatusNotFound,
+			wantNil:    true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			res := makeTestResponse(tt.statusCode)
+			err := ignoreHTTPStatus422(res)
+			if tt.wantIgnore {
+				assert.Equal(t, api.ErrIgnoreAndContinue, err)
+			} else if tt.wantNil {
+				assert.Nil(t, err)
+			}
+		})
+	}
+}