From ee1dc842397efc37d09778dae2c61ba23831b205 Mon Sep 17 00:00:00 2001
From: Sergey Sharybin <sergey.vfx@gmail.com>
Date: Wed, 21 Mar 2012 17:34:31 +0000
Subject: [PATCH] Fix for crash on selecting loop in cases when some edges
 aren't connected to any faces.

---
 source/blender/bmesh/intern/bmesh_walkers_impl.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/source/blender/bmesh/intern/bmesh_walkers_impl.c b/source/blender/bmesh/intern/bmesh_walkers_impl.c
index fdc5f5f38c0..8efcf9498f4 100644
--- a/source/blender/bmesh/intern/bmesh_walkers_impl.c
+++ b/source/blender/bmesh/intern/bmesh_walkers_impl.c
@@ -412,9 +412,15 @@ static void bmw_LoopWalker_begin(BMWalker *walker, void *data)
 			}
 		}
 
-		/* only use hub selection for 5+ sides else this could
-		 * conflict with normal edge loop selection. */
-		lwalk->f_hub = f_best->len > 4 ? f_best : NULL;
+		if (f_best) {
+			/* only use hub selection for 5+ sides else this could
+			 * conflict with normal edge loop selection. */
+			lwalk->f_hub = f_best->len > 4 ? f_best : NULL;
+		}
+		else {
+			/* edge doesn't have any faces connected to it */
+			lwalk->f_hub = NULL;
+		}
 	}
 	else {
 		lwalk->f_hub = NULL;