From f8350c63041c8ba042c105fcbf78c9207d3b7dc5 Mon Sep 17 00:00:00 2001
From: turturica <Ionut Turturica>
Date: Sat, 21 Apr 2018 19:51:33 -0700
Subject: [PATCH] Fix an issue that popped up only on Windows.

---
 _pytest/nodes.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/_pytest/nodes.py b/_pytest/nodes.py
index dfe63b220..33752064f 100644
--- a/_pytest/nodes.py
+++ b/_pytest/nodes.py
@@ -329,7 +329,7 @@ class FSCollector(Collector):
 
             if not nodeid:
                 nodeid = _check_initialpaths_for_relpath(session, fspath)
-            if os.sep != SEP:
+            if nodeid and os.sep != SEP:
                 nodeid = nodeid.replace(os.sep, SEP)
 
         super(FSCollector, self).__init__(name, parent, config, session, nodeid=nodeid, fspath=fspath)