diff --git a/atom/browser/web_view/web_view_manager.cc b/atom/browser/web_view/web_view_manager.cc
index 032be04e7820..c638c18e123a 100644
--- a/atom/browser/web_view/web_view_manager.cc
+++ b/atom/browser/web_view/web_view_manager.cc
@@ -80,13 +80,19 @@ void WebViewManager::AddGuest(int guest_instance_id,
 }
 
 void WebViewManager::RemoveGuest(int guest_instance_id) {
+  if (!ContainsKey(web_contents_map_, guest_instance_id)) {
+    return;
+  }
+
   auto web_contents = web_contents_map_[guest_instance_id].web_contents;
+
   content::BrowserThread::PostTask(
       content::BrowserThread::IO, FROM_HERE,
       base::Bind(
           &WebViewRendererState::RemoveGuest,
           base::Unretained(WebViewRendererState::GetInstance()),
           web_contents->GetRenderProcessHost()->GetID()));
+
   web_contents_map_.erase(guest_instance_id);
 
   // Remove the record of element in embedder too.