diff --git a/api/messaging/src/index.ts b/api/messaging/src/index.ts
index 257075c4d..c17b4e848 100644
--- a/api/messaging/src/index.ts
+++ b/api/messaging/src/index.ts
@@ -26,7 +26,11 @@ export const sendToBackground: PlasmoMessaging.SendFx<MessageName> = async (
  */
 export const sendToContentScript: PlasmoMessaging.SendFx = async (req) => {
   const tabId =
-    typeof req.tabId === "number" ? req.tabId : (await getActiveTab()).id
+    typeof req.tabId === "number" ? req.tabId : (await getActiveTab())?.id
+
+  if (!tabId) {
+    throw new Error("No active tab found to send message to.")
+  }
 
   return getExtTabs().sendMessage(tabId, req)
 }
diff --git a/api/messaging/src/utils.ts b/api/messaging/src/utils.ts
index 16bfaa5a2..0ffc3ec6c 100644
--- a/api/messaging/src/utils.ts
+++ b/api/messaging/src/utils.ts
@@ -27,7 +27,7 @@ export const getActiveTab = async () => {
     active: true,
     currentWindow: true
   })
-  return tab
+  return tab as chrome.tabs.Tab | undefined
 }
 
 export const isSameOrigin = (