diff --git a/scripts/content.js b/scripts/content.js
index 4845f8e..00f8e63 100644
--- a/scripts/content.js
+++ b/scripts/content.js
@@ -36,12 +36,23 @@ chrome.runtime.onMessage.addListener(
 );
 
 function extractTabData(itemsSelector, fieldSelectors) {
-    return $(itemsSelector).toArray().map(
-        item => fieldSelectors.map(
-            selector => {
-                let [cls, attr] = selector.split('@').slice(0, 2);
-                return $(item).find(cls).toArray().map(find => attr ? find[attr] : find.textContent.trim()).join('\n')
-            }
-        )
+    let fieldNotFound = false;
+    let results = $(itemsSelector).toArray().map(
+        item => {
+            return fieldSelectors.map(
+                selector => {
+                    let [cls, attr] = selector.split('@').slice(0, 2);
+                    // TODO: close tab to cancel task tip
+                    if (fieldNotFound) return;
+                    let fieldVals = $(item).find(cls).toArray();
+                    if (!fieldVals.length) {
+                        fieldNotFound = true;
+                        return;
+                    }
+                    return fieldVals.map(find => attr ? find[attr] : find.textContent.trim()).join('\n')
+                }
+            )
+        }
     );
+    return fieldNotFound ? [] : results
 }
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