diff --git a/CHANGELOG.md b/CHANGELOG.md
index f500d2bc055..9efc8d182d1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -61,6 +61,7 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- Plugins/packages: reject blank `openclaw.runtimeExtensions` entries instead of silently ignoring them and falling back to inferred TypeScript runtime entries. Thanks @vincentkoc.
 - Doctor/plugins: remove stale managed npm plugin shadow entries from the managed package lock as well as `package.json` and `node_modules`, so future npm operations do not keep referencing repaired bundled-plugin shadows. Thanks @vincentkoc.
 - Plugins/runtime state: keep the key being registered when namespace eviction runs in the same millisecond as existing entries, so `register` and `registerIfAbsent` do not report success while evicting their own fresh value. Thanks @vincentkoc.
 - Control UI/Talk: make failed Talk startup errors dismissable and clear the stale Talk error state when dismissed, so missing realtime voice provider configuration does not leave a permanent chat banner. Fixes #77071. Thanks @ijoshdavis.
diff --git a/src/plugins/discovery.test.ts b/src/plugins/discovery.test.ts
index a5f8a483c34..7536b0d8c31 100644
--- a/src/plugins/discovery.test.ts
+++ b/src/plugins/discovery.test.ts
@@ -928,6 +928,34 @@ describe("discoverOpenClawPlugins", () => {
     ).toBe(true);
   });
 
+  it("rejects blank package runtimeExtensions before falling back to inferred entries", async () => {
+    const stateDir = makeTempDir();
+    const pluginDir = path.join(stateDir, "extensions", "runtime-blank-pack");
+    mkdirSafe(path.join(pluginDir, "src"));
+    mkdirSafe(path.join(pluginDir, "dist"));
+
+    writePluginPackageManifest({
+      packageDir: pluginDir,
+      packageName: "@openclaw/runtime-blank-pack",
+      extensions: ["./src/index.ts"],
+      runtimeExtensions: [" "],
+    });
+    writePluginEntry(path.join(pluginDir, "src", "index.ts"));
+    writePluginEntry(path.join(pluginDir, "dist", "index.js"));
+
+    const result = await discoverWithStateDir(stateDir, {});
+
+    expectCandidatePresence(result, { absent: ["runtime-blank-pack"] });
+    expect(
+      result.diagnostics.some(
+        (entry) =>
+          entry.level === "error" &&
+          entry.message.includes("openclaw.runtimeExtensions[0]") &&
+          entry.message.includes("non-empty string"),
+      ),
+    ).toBe(true);
+  });
+
   it("infers built dist entries for installed TypeScript package plugins", async () => {
     const stateDir = makeTempDir();
     const pluginDir = path.join(stateDir, "extensions", "built-peer-pack");
diff --git a/src/plugins/install.test.ts b/src/plugins/install.test.ts
index 2416408024a..a74f63ef93b 100644
--- a/src/plugins/install.test.ts
+++ b/src/plugins/install.test.ts
@@ -985,6 +985,37 @@ describe("installPluginFromArchive", () => {
     }
   });
 
+  it("rejects package installs when runtimeExtensions contains a blank entry", async () => {
+    const { pluginDir, extensionsDir } = setupPluginInstallDirs();
+    fs.mkdirSync(path.join(pluginDir, "src"), { recursive: true });
+    fs.mkdirSync(path.join(pluginDir, "dist"), { recursive: true });
+    fs.writeFileSync(
+      path.join(pluginDir, "package.json"),
+      JSON.stringify({
+        name: "runtime-blank-plugin",
+        version: "1.0.0",
+        openclaw: {
+          extensions: ["./src/index.ts"],
+          runtimeExtensions: [" "],
+        },
+      }),
+    );
+    fs.writeFileSync(path.join(pluginDir, "src", "index.ts"), "export {};\n");
+    fs.writeFileSync(path.join(pluginDir, "dist", "index.js"), "export {};\n");
+
+    const result = await installPluginFromDir({
+      dirPath: pluginDir,
+      extensionsDir,
+    });
+
+    expect(result.ok).toBe(false);
+    if (!result.ok) {
+      expect(result.code).toBe(PLUGIN_INSTALL_ERROR_CODE.INVALID_OPENCLAW_EXTENSIONS);
+      expect(result.error).toContain("openclaw.runtimeExtensions[0]");
+      expect(result.error).toContain("non-empty string");
+    }
+  });
+
   it("rejects package installs when runtimeSetupEntry is missing", async () => {
     const { pluginDir, extensionsDir } = setupPluginInstallDirs();
     fs.mkdirSync(path.join(pluginDir, "src"), { recursive: true });
diff --git a/src/plugins/package-entry-resolution.ts b/src/plugins/package-entry-resolution.ts
index f117562abd6..b92f55ea393 100644
--- a/src/plugins/package-entry-resolution.ts
+++ b/src/plugins/package-entry-resolution.ts
@@ -21,6 +21,8 @@ type RuntimeExtensionsResolution =
   | { ok: true; runtimeExtensions: string[] }
   | { ok: false; error: string };
 
+type PackageManifestStringList = { ok: true; entries: string[] } | { ok: false; error: string };
+
 function runtimeExtensionsLengthMismatchMessage(params: {
   runtimeExtensionsLength: number;
   extensionsLength: number;
@@ -31,11 +33,25 @@ function runtimeExtensionsLengthMismatchMessage(params: {
   );
 }
 
-function normalizePackageManifestStringList(value: unknown): string[] {
-  if (!Array.isArray(value)) {
-    return [];
+function readPackageManifestStringList(params: {
+  fieldName: string;
+  value: unknown;
+}): PackageManifestStringList {
+  if (!Array.isArray(params.value)) {
+    return { ok: true, entries: [] };
   }
-  return value.map((entry) => normalizeOptionalString(entry) ?? "").filter(Boolean);
+  const entries: string[] = [];
+  for (const [index, entry] of params.value.entries()) {
+    const normalized = normalizeOptionalString(entry);
+    if (!normalized) {
+      return {
+        ok: false,
+        error: `package.json ${params.fieldName}[${index}] must be a non-empty string`,
+      };
+    }
+    entries.push(normalized);
+  }
+  return { ok: true, entries };
 }
 
 function resolvePackageRuntimeExtensionEntries(params: {
@@ -43,7 +59,14 @@ function resolvePackageRuntimeExtensionEntries(params: {
   extensions: readonly string[];
 }): RuntimeExtensionsResolution {
   const packageManifest = getPackageManifestMetadata(params.manifest ?? undefined);
-  const runtimeExtensions = normalizePackageManifestStringList(packageManifest?.runtimeExtensions);
+  const runtimeExtensionsResult = readPackageManifestStringList({
+    fieldName: "openclaw.runtimeExtensions",
+    value: packageManifest?.runtimeExtensions,
+  });
+  if (!runtimeExtensionsResult.ok) {
+    return runtimeExtensionsResult;
+  }
+  const runtimeExtensions = runtimeExtensionsResult.entries;
   if (runtimeExtensions.length === 0) {
     return { ok: true, runtimeExtensions: [] };
   }