From 44f4bd02d201f22e154b870747aa0b072fe27604 Mon Sep 17 00:00:00 2001
From: Gerhard Gappmeier <gerhard.gappmeier@ascolab.com>
Date: Wed, 25 Apr 2018 13:41:03 +0200
Subject: [PATCH] Fix issue setting mark on invalid line.

Error detected while processing function <SNR>32_ShowMarks:
line   39:
E885: Not possible to change sign ShowMark76
---
 plugin/showmarks.vim | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/plugin/showmarks.vim b/plugin/showmarks.vim
index affd240..de405a4 100644
--- a/plugin/showmarks.vim
+++ b/plugin/showmarks.vim
@@ -374,8 +374,10 @@ fun! s:ShowMarks()
 				let mark_at{ln} = nm
 				if !exists('b:placed_'.nm) || b:placed_{nm} != ln
 					exe 'sign unplace '.id.' buffer='.winbufnr(0)
-					exe 'sign place '.id.' name=ShowMark'.nm.' line='.ln.' buffer='.winbufnr(0)
-					let b:placed_{nm} = ln
+					if ln > 0
+						exe 'sign place '.id.' name=ShowMark'.nm.' line='.ln.' buffer='.winbufnr(0)
+						let b:placed_{nm} = ln
+					endif
 				endif
 			endif
 		endif