diff --git a/src/core/cwuri.c b/src/core/cwuri.c
index f649ba44..893e2050 100644
--- a/src/core/cwuri.c
+++ b/src/core/cwuri.c
@@ -38,9 +38,11 @@ struct uri *cwuri = NULL;
  * @v uri		New working URI, or NULL
  */
 void churi ( struct uri *uri ) {
-	struct uri *new_uri;
+	struct uri *new_uri = NULL;
+
+	if ( uri )
+		new_uri = resolve_uri ( cwuri, uri );
 
-	new_uri = resolve_uri ( cwuri, uri );
 	uri_put ( cwuri );
 	cwuri = new_uri;
 }