diff --git a/package.json b/package.json
index 33b8887..07293fa 100644
--- a/package.json
+++ b/package.json
@@ -21,6 +21,7 @@
     "test:ui": "vitest --ui",
     "test:coverage": "vitest run --coverage",
     "test:commands": "tsx tests/command-coverage.ts",
+    "prepare": "npm_config_global=false npm install --ignore-scripts && tsc && chmod +x dist/main.js",
     "prepublishOnly": "npm run build && npm run test && test -x dist/main.js"
   },
   "engines": {
diff --git a/src/utils/graphql-issues-service.ts b/src/utils/graphql-issues-service.ts
index 6a5e1fe..61baba8 100644
--- a/src/utils/graphql-issues-service.ts
+++ b/src/utils/graphql-issues-service.ts
@@ -881,10 +881,12 @@ export class GraphQLIssuesService {
         id: comment.id,
         body: comment.body,
         embeds: extractEmbeds(comment.body),
-        user: {
-          id: comment.user.id,
-          name: comment.user.name,
-        },
+        user: comment.user
+          ? {
+            id: comment.user.id,
+            name: comment.user.name,
+          }
+          : undefined,
         createdAt: comment.createdAt instanceof Date
           ? comment.createdAt.toISOString()
           : (comment.createdAt
diff --git a/src/utils/linear-types.d.ts b/src/utils/linear-types.d.ts
index ec24d51..29c775d 100644
--- a/src/utils/linear-types.d.ts
+++ b/src/utils/linear-types.d.ts
@@ -60,7 +60,7 @@ export interface LinearIssue {
       url: string;
       expiresAt: string;
     }>;
-    user: {
+    user?: {
       id: string;
       name: string;
     };
@@ -153,7 +153,7 @@ export interface CreateCommentArgs {
 export interface LinearComment {
   id: string;
   body: string;
-  user: {
+  user?: {
     id: string;
     name: string;
   };
diff --git a/tests/unit/graphql-issues-service-null-comment-user.test.ts b/tests/unit/graphql-issues-service-null-comment-user.test.ts
new file mode 100644
index 0000000..d12dd49
--- /dev/null
+++ b/tests/unit/graphql-issues-service-null-comment-user.test.ts
@@ -0,0 +1,92 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { GraphQLIssuesService } from "../../src/utils/graphql-issues-service.js";
+import type { GraphQLService } from "../../src/utils/graphql-service.js";
+
+/**
+ * Unit tests for null comment.user handling in doTransformIssueData.
+ *
+ * When a Linear issue has automated/synced comments (e.g. from GitHub
+ * integration), the `user` field on the comment can be `null`.
+ * Previously this caused: Cannot read properties of null (reading 'id').
+ */
+
+function makeIssueResponse(commentOverrides: Record<string, unknown> = {}) {
+  return {
+    issue: {
+      id: "issue-1",
+      identifier: "ENG-100",
+      title: "Test Issue",
+      description: null,
+      branchName: null,
+      priority: 0,
+      estimate: null,
+      state: { id: "state-1", name: "In Progress" },
+      assignee: null,
+      team: { id: "team-1", key: "ENG", name: "Engineering" },
+      project: null,
+      cycle: null,
+      projectMilestone: null,
+      labels: { nodes: [] },
+      parent: null,
+      children: { nodes: [] },
+      comments: {
+        nodes: [
+          {
+            id: "comment-1",
+            body: "Automated sync comment",
+            user: null,
+            createdAt: "2025-01-01T00:00:00Z",
+            updatedAt: "2025-01-01T00:00:00Z",
+            ...commentOverrides,
+          },
+        ],
+      },
+      createdAt: "2025-01-01T00:00:00Z",
+      updatedAt: "2025-01-01T00:00:00Z",
+    },
+  };
+}
+
+describe("GraphQLIssuesService - Null Comment User", () => {
+  let mockGraphQLService: { rawRequest: ReturnType<typeof vi.fn> };
+  let service: GraphQLIssuesService;
+
+  beforeEach(() => {
+    mockGraphQLService = {
+      rawRequest: vi.fn(),
+    };
+    service = new GraphQLIssuesService(
+      mockGraphQLService as unknown as GraphQLService,
+    );
+  });
+
+  it("should handle comment with null user without crashing", async () => {
+    mockGraphQLService.rawRequest.mockResolvedValue(makeIssueResponse());
+
+    const result = await service.getIssueById(
+      "550e8400-e29b-41d4-a716-446655440000",
+    );
+
+    expect(result.comments).toHaveLength(1);
+    expect(result.comments![0].user).toBeUndefined();
+    expect(result.comments![0].body).toBe("Automated sync comment");
+  });
+
+  it("should preserve user when present on comment", async () => {
+    mockGraphQLService.rawRequest.mockResolvedValue(
+      makeIssueResponse({
+        user: { id: "user-1", name: "Alice" },
+      }),
+    );
+
+    const result = await service.getIssueById(
+      "550e8400-e29b-41d4-a716-446655440000",
+    );
+
+    expect(result.comments).toHaveLength(1);
+    expect(result.comments![0].user).toEqual({
+      id: "user-1",
+      name: "Alice",
+    });
+  });
+});