diff --git a/autoload/tagbar.vim b/autoload/tagbar.vim
index b38b6d9..0829845 100644
--- a/autoload/tagbar.vim
+++ b/autoload/tagbar.vim
@@ -1025,11 +1025,13 @@ function! s:ProcessFile(fname, ftype) abort
     " Parse the ctags output lines
     call tagbar#debug#log('Parsing ctags output')
     let rawtaglist = split(ctags_output, '\n\+')
+    let seen = {}
     for line in rawtaglist
-        " skip comments
-        if line =~# '^!_TAG_'
+        " skip comments and duplicates (can happen when --sort=no)
+        if line =~# '^!_TAG_' || has_key(seen, line)
             continue
         endif
+        let seen[line] = 1
 
         let parts = split(line, ';"')
         if len(parts) == 2 " Is a valid tag line
@@ -1259,7 +1261,7 @@ function! s:ParseTagline(part1, part2, typeinfo, fileinfo) abort
 endfunction
 
 " s:ProcessTag() {{{2
-function s:ProcessTag(name, filename, pattern, fields, is_split, typeinfo, fileinfo) abort
+function! s:ProcessTag(name, filename, pattern, fields, is_split, typeinfo, fileinfo) abort
     if a:is_split
         let taginfo = tagbar#prototypes#splittag#new(a:name)
     else