autoload/handlers.vim | 4 +++-

diff --git a/autoload/handlers.vim b/autoload/handlers.vim
index c17de720915ffa4a1133ab4841ce947f987b24c8..f6804165a830443aa607e743a86fd4990316b585 100644
--- a/autoload/handlers.vim
+++ b/autoload/handlers.vim
@@ -103,7 +103,9 @@   lspserver.ready = true
 
   # if the outline window is opened, then request the symbols for the current
   # buffer
-  lspserver.getDocSymbols(@%)
+  if bufwinid('LSP-Outline') != -1
+    lspserver.getDocSymbols(@%)
+  endif
 enddef
 
 # process the 'textDocument/definition' / 'textDocument/declaration' /