Commit: 140d383393764f28405b34775b2e0dc22c51e5a6
Author: Campbell Barton
Date:   Wed Nov 21 05:21:18 2018 +1100
Branches: blender2.8
https://developer.blender.org/rB140d383393764f28405b34775b2e0dc22c51e5a6

Fix T57935: Crash Alt clicking w/ poly build tool

===================================================================

M       source/blender/editors/mesh/editmesh_polybuild.c

===================================================================

diff --git a/source/blender/editors/mesh/editmesh_polybuild.c 
b/source/blender/editors/mesh/editmesh_polybuild.c
index 882ee3092b4..c175102511a 100644
--- a/source/blender/editors/mesh/editmesh_polybuild.c
+++ b/source/blender/editors/mesh/editmesh_polybuild.c
@@ -426,7 +426,10 @@ static int edbm_polybuild_dissolve_at_cursor_invoke(
        BMEditMesh *em = vc.em;
        BMesh *bm = em->bm;
 
-       if (ele_act->head.htype == BM_EDGE) {
+       if (ele_act == NULL) {
+               /* pass */
+       }
+       else if (ele_act->head.htype == BM_EDGE) {
                BMEdge *e_act = (BMEdge *)ele_act;
                BMLoop *l_a, *l_b;
                if (BM_edge_loop_pair(e_act, &l_a, &l_b)) {

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