From 960a377fd1879082dbe0266533202d47cfdd5683 Mon Sep 17 00:00:00 2001
From: "jan.nijtmans" <nijtmans@users.sourceforge.net>
Date: Wed, 20 Nov 2013 11:34:29 +0000
Subject: ... and don't break env-5.3 and env-5.5 test-cases.

---
 generic/tclEnv.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/generic/tclEnv.c b/generic/tclEnv.c
index 7c49d44..8f51c1b 100644
--- a/generic/tclEnv.c
+++ b/generic/tclEnv.c
@@ -614,6 +614,7 @@ EnvTraceProc(
 	const char *value = TclGetEnv(name2, &valueString);
 
 	if (value == NULL) {
+	    Tcl_UnsetVar2(interp, name1, name2, 0);
 	    return NULL;
 	}
 	Tcl_SetVar2(interp, name1, name2, value, 0);
-- 
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