diff --git a/metagpt/roles/researcher.py b/metagpt/roles/researcher.py
index fd40960e2..5c6c1d9f4 100644
--- a/metagpt/roles/researcher.py
+++ b/metagpt/roles/researcher.py
@@ -58,7 +58,7 @@ class Researcher(Role):
             )
         elif isinstance(todo, WebBrowseAndSummarize):
             links = instruct_content.links
-            todos = (todo.run(*url, query=query, system_text=research_system_text) for (query, url) in links.items())
+            todos = (todo.run(*url, query=query, system_text=research_system_text) for (query, url) in links.items() if url)
             if self.enable_concurrency:
                 summaries = await asyncio.gather(*todos)
             else: