diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6084a3cf6..a525084be 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -143,6 +143,7 @@
 - Auto-reply: align `/think` default display with model reasoning defaults. (#751) — thanks @gabriel-trigo.
 - Auto-reply: flush block reply buffers on tool boundaries. (#750) — thanks @sebslight.
 - Auto-reply: allow sender fallback for command authorization when `SenderId` is empty (WhatsApp self-chat). (#755) — thanks @juanpablodlc.
+- Auto-reply: treat whitespace-only sender ids as missing for command authorization (WhatsApp self-chat).
 - Heartbeat: refresh prompt text for updated defaults.
 - Agents/Tools: use PowerShell on Windows to capture system utility output. (#748) — thanks @myfunc.
 - Docker: tolerate unset optional env vars in docker-setup.sh under strict mode. (#725) — thanks @petradonka.
diff --git a/src/auto-reply/command-auth.test.ts b/src/auto-reply/command-auth.test.ts
index 099cf552f..850cf97eb 100644
--- a/src/auto-reply/command-auth.test.ts
+++ b/src/auto-reply/command-auth.test.ts
@@ -27,4 +27,50 @@ describe("resolveCommandAuthorization", () => {
     expect(auth.senderId).toBe("+123");
     expect(auth.isAuthorizedSender).toBe(true);
   });
+
+  it("falls back from whitespace SenderId to SenderE164", () => {
+    const cfg = {
+      whatsapp: { allowFrom: ["+123"] },
+    } as ClawdbotConfig;
+
+    const ctx = {
+      Provider: "whatsapp",
+      Surface: "whatsapp",
+      From: "whatsapp:+999",
+      SenderId: "   ",
+      SenderE164: "+123",
+    } as MsgContext;
+
+    const auth = resolveCommandAuthorization({
+      ctx,
+      cfg,
+      commandAuthorized: true,
+    });
+
+    expect(auth.senderId).toBe("+123");
+    expect(auth.isAuthorizedSender).toBe(true);
+  });
+
+  it("falls back to From when SenderId and SenderE164 are whitespace", () => {
+    const cfg = {
+      whatsapp: { allowFrom: ["+999"] },
+    } as ClawdbotConfig;
+
+    const ctx = {
+      Provider: "whatsapp",
+      Surface: "whatsapp",
+      From: "whatsapp:+999",
+      SenderId: "   ",
+      SenderE164: "   ",
+    } as MsgContext;
+
+    const auth = resolveCommandAuthorization({
+      ctx,
+      cfg,
+      commandAuthorized: true,
+    });
+
+    expect(auth.senderId).toBe("+999");
+    expect(auth.isAuthorizedSender).toBe(true);
+  });
 });
diff --git a/src/auto-reply/command-auth.ts b/src/auto-reply/command-auth.ts
index db268e124..fa6ba919f 100644
--- a/src/auto-reply/command-auth.ts
+++ b/src/auto-reply/command-auth.ts
@@ -96,7 +96,9 @@ export function resolveCommandAuthorization(params: {
   }
   const ownerList = ownerCandidates;
 
-  const senderRaw = ctx.SenderId || ctx.SenderE164 || from;
+  const senderIdCandidate = ctx.SenderId?.trim() ?? "";
+  const senderE164Candidate = ctx.SenderE164?.trim() ?? "";
+  const senderRaw = senderIdCandidate || senderE164Candidate || from;
   const senderId = senderRaw
     ? formatAllowFromList({
         dock,
diff --git a/src/web/auto-reply.test.ts b/src/web/auto-reply.test.ts
index a731a13a2..7d9ae7a89 100644
--- a/src/web/auto-reply.test.ts
+++ b/src/web/auto-reply.test.ts
@@ -153,6 +153,53 @@ describe("partial reply gating", () => {
     expect(reply).toHaveBeenCalledWith("final reply");
   });
 
+  it("falls back from empty senderJid to senderE164 for SenderId", async () => {
+    const reply = vi.fn().mockResolvedValue(undefined);
+    const sendComposing = vi.fn().mockResolvedValue(undefined);
+    const sendMedia = vi.fn().mockResolvedValue(undefined);
+
+    const replyResolver = vi.fn().mockResolvedValue({ text: "final reply" });
+
+    const mockConfig: ClawdbotConfig = {
+      whatsapp: {
+        allowFrom: ["*"],
+      },
+    };
+
+    setLoadConfigMock(mockConfig);
+
+    await monitorWebProvider(
+      false,
+      async ({ onMessage }) => {
+        await onMessage({
+          id: "m1",
+          from: "+1000",
+          conversationId: "+1000",
+          to: "+2000",
+          body: "hello",
+          timestamp: Date.now(),
+          chatType: "direct",
+          chatId: "direct:+1000",
+          senderJid: "",
+          senderE164: "+1000",
+          sendComposing,
+          reply,
+          sendMedia,
+        });
+        return { close: vi.fn().mockResolvedValue(undefined) };
+      },
+      false,
+      replyResolver,
+    );
+
+    resetLoadConfigMock();
+
+    expect(replyResolver).toHaveBeenCalledTimes(1);
+    const ctx = replyResolver.mock.calls[0]?.[0] ?? {};
+    expect(ctx.SenderE164).toBe("+1000");
+    expect(ctx.SenderId).toBe("+1000");
+  });
+
   it("updates last-route for direct chats without senderE164", async () => {
     const now = Date.now();
     const mainSessionKey = "agent:main:main";
diff --git a/src/web/auto-reply.ts b/src/web/auto-reply.ts
index 21dc06286..869f333d8 100644
--- a/src/web/auto-reply.ts
+++ b/src/web/auto-reply.ts
@@ -1291,7 +1291,7 @@ export async function monitorWebProvider(
             msg.senderE164,
           ),
           SenderName: msg.senderName,
-          SenderId: msg.senderJid ?? msg.senderE164,
+          SenderId: msg.senderJid?.trim() || msg.senderE164,
           SenderE164: msg.senderE164,
           WasMentioned: msg.wasMentioned,
           ...(msg.location ? toLocationContext(msg.location) : {}),