diff --git a/src/version.test.ts b/src/version.test.ts
index d8d1f4fa5..c6bc5acf0 100644
--- a/src/version.test.ts
+++ b/src/version.test.ts
@@ -23,17 +23,22 @@ function moduleUrlFrom(root: string, relativePath: string): string {
   return pathToFileURL(path.join(root, relativePath)).href;
 }
 
+async function ensureModuleFixture(root: string, relativePath = "dist/plugin-sdk/index.js") {
+  await fs.mkdir(path.dirname(path.join(root, relativePath)), { recursive: true });
+  return moduleUrlFrom(root, relativePath);
+}
+
+async function writeJsonFixture(root: string, relativePath: string, value: unknown) {
+  const filePath = path.join(root, relativePath);
+  await fs.mkdir(path.dirname(filePath), { recursive: true });
+  await fs.writeFile(filePath, JSON.stringify(value), "utf-8");
+}
+
 describe("version resolution", () => {
   it("resolves package version from nested dist/plugin-sdk module URL", async () => {
     await withTempDir(async (root) => {
-      await fs.mkdir(path.join(root, "dist", "plugin-sdk"), { recursive: true });
-      await fs.writeFile(
-        path.join(root, "package.json"),
-        JSON.stringify({ name: "openclaw", version: "1.2.3" }),
-        "utf-8",
-      );
-
-      const moduleUrl = moduleUrlFrom(root, "dist/plugin-sdk/index.js");
+      await writeJsonFixture(root, "package.json", { name: "openclaw", version: "1.2.3" });
+      const moduleUrl = await ensureModuleFixture(root);
       expect(readVersionFromPackageJsonForModuleUrl(moduleUrl)).toBe("1.2.3");
       expect(resolveVersionFromModuleUrl(moduleUrl)).toBe("1.2.3");
     });
@@ -41,33 +46,20 @@ describe("version resolution", () => {
 
   it("ignores unrelated nearby package.json files", async () => {
     await withTempDir(async (root) => {
-      await fs.mkdir(path.join(root, "dist", "plugin-sdk"), { recursive: true });
-      await fs.writeFile(
-        path.join(root, "package.json"),
-        JSON.stringify({ name: "openclaw", version: "2.3.4" }),
-        "utf-8",
-      );
-      await fs.writeFile(
-        path.join(root, "dist", "package.json"),
-        JSON.stringify({ name: "other-package", version: "9.9.9" }),
-        "utf-8",
-      );
-
-      const moduleUrl = moduleUrlFrom(root, "dist/plugin-sdk/index.js");
+      await writeJsonFixture(root, "package.json", { name: "openclaw", version: "2.3.4" });
+      await writeJsonFixture(root, "dist/package.json", {
+        name: "other-package",
+        version: "9.9.9",
+      });
+      const moduleUrl = await ensureModuleFixture(root);
       expect(readVersionFromPackageJsonForModuleUrl(moduleUrl)).toBe("2.3.4");
     });
   });
 
   it("falls back to build-info when package metadata is unavailable", async () => {
     await withTempDir(async (root) => {
-      await fs.mkdir(path.join(root, "dist", "plugin-sdk"), { recursive: true });
-      await fs.writeFile(
-        path.join(root, "build-info.json"),
-        JSON.stringify({ version: "4.5.6" }),
-        "utf-8",
-      );
-
-      const moduleUrl = moduleUrlFrom(root, "dist/plugin-sdk/index.js");
+      await writeJsonFixture(root, "build-info.json", { version: "4.5.6" });
+      const moduleUrl = await ensureModuleFixture(root);
       expect(readVersionFromPackageJsonForModuleUrl(moduleUrl)).toBeNull();
       expect(readVersionFromBuildInfoForModuleUrl(moduleUrl)).toBe("4.5.6");
       expect(resolveVersionFromModuleUrl(moduleUrl)).toBe("4.5.6");
@@ -76,15 +68,30 @@ describe("version resolution", () => {
 
   it("returns null when no version metadata exists", async () => {
     await withTempDir(async (root) => {
-      await fs.mkdir(path.join(root, "dist", "plugin-sdk"), { recursive: true });
-
-      const moduleUrl = moduleUrlFrom(root, "dist/plugin-sdk/index.js");
+      const moduleUrl = await ensureModuleFixture(root);
       expect(readVersionFromPackageJsonForModuleUrl(moduleUrl)).toBeNull();
       expect(readVersionFromBuildInfoForModuleUrl(moduleUrl)).toBeNull();
       expect(resolveVersionFromModuleUrl(moduleUrl)).toBeNull();
     });
   });
 
+  it("ignores non-openclaw package and blank build-info versions", async () => {
+    await withTempDir(async (root) => {
+      await writeJsonFixture(root, "package.json", { name: "other-package", version: "9.9.9" });
+      await writeJsonFixture(root, "build-info.json", { version: "  " });
+      const moduleUrl = await ensureModuleFixture(root);
+      expect(readVersionFromPackageJsonForModuleUrl(moduleUrl)).toBeNull();
+      expect(readVersionFromBuildInfoForModuleUrl(moduleUrl)).toBeNull();
+      expect(resolveVersionFromModuleUrl(moduleUrl)).toBeNull();
+    });
+  });
+
+  it("returns null for malformed module URLs", () => {
+    expect(readVersionFromPackageJsonForModuleUrl("not-a-valid-url")).toBeNull();
+    expect(readVersionFromBuildInfoForModuleUrl("not-a-valid-url")).toBeNull();
+    expect(resolveVersionFromModuleUrl("not-a-valid-url")).toBeNull();
+  });
+
   it("prefers OPENCLAW_VERSION over service and package versions", () => {
     expect(
       resolveRuntimeServiceVersion({