diff --git a/autoload/airline/extensions/languageclient.vim b/autoload/airline/extensions/languageclient.vim
index f9b7771..82fed28 100644
--- a/autoload/airline/extensions/languageclient.vim
+++ b/autoload/airline/extensions/languageclient.vim
@@ -67,7 +67,7 @@ function! airline#extensions#languageclient#get(type)
 
   let cnt = 0
   for d in s:diagnostics_for_buffer()
-    if d.severity == a:type
+    if has_key(d, 'severity') && d.severity == a:type
       let cnt += 1
     endif
   endfor