diff --git a/packages/loopover-miner/lib/chat-action-dispatch.js b/packages/loopover-miner/lib/chat-action-dispatch.js
index 11b44bf25..1faaca4db 100644
--- a/packages/loopover-miner/lib/chat-action-dispatch.js
+++ b/packages/loopover-miner/lib/chat-action-dispatch.js
@@ -71,7 +71,15 @@ export async function dispatchChatAction(request, options = {}) {
     return { ok: false, status: "invalid_params", action };
   }
 
-  const result = await registered.handler(request);
+  let result;
+  try {
+    result = await registered.handler(request);
+  } catch (error) {
+    // A handler that throws fails closed with the module's typed result shape (#6989), consistent with the
+    // paramsValidator catch above -- a distinct "handler_error" status lets a caller tell an execution
+    // failure apart from a params-validation failure.
+    return { ok: false, status: "handler_error", action, error: error instanceof Error ? error.message : String(error) };
+  }
   return { ok: true, status: "dispatched", action, result };
 }
 
diff --git a/test/unit/miner-chat-action-dispatch.test.ts b/test/unit/miner-chat-action-dispatch.test.ts
index f8df273c1..daafef0bc 100644
--- a/test/unit/miner-chat-action-dispatch.test.ts
+++ b/test/unit/miner-chat-action-dispatch.test.ts
@@ -147,4 +147,21 @@ describe("dispatchChatAction (#6519)", () => {
     const result = await dispatchChatAction({ action: "demo", params: {} }, { env: enabledEnv, registry });
     expect(result).toEqual({ ok: false, status: "invalid_params", action: "demo", error: "boom" });
   });
+
+  it("fails closed with handler_error when the handler throws, not an unhandled rejection (#6989)", async () => {
+    const registry = registryWith("demo", () => true, () => {
+      throw new Error("network down");
+    });
+    const result = await dispatchChatAction({ action: "demo", params: {} }, { env: enabledEnv, registry });
+    // Distinct from invalid_params so a caller can tell an execution failure from a validation failure.
+    expect(result).toEqual({ ok: false, status: "handler_error", action: "demo", error: "network down" });
+  });
+
+  it("stringifies a non-Error thrown by the handler (#6989)", async () => {
+    const registry = registryWith("demo", () => true, () => {
+      throw "kaboom";
+    });
+    const result = await dispatchChatAction({ action: "demo", params: {} }, { env: enabledEnv, registry });
+    expect(result).toEqual({ ok: false, status: "handler_error", action: "demo", error: "kaboom" });
+  });
 });