From 09ab1cca2d7fb8cdbb252feb4d1ef7945249c051 Mon Sep 17 00:00:00 2001
From: "Liam P. White" <inkscapebronyat-signgmaildotcom>
Date: Fri, 4 Apr 2014 15:37:48 -0400
Subject: Prevent crash on "three knot" issue

(bzr r13090.1.47)
---
 src/knotholder.cpp | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

(limited to 'src/knotholder.cpp')

diff --git a/src/knotholder.cpp b/src/knotholder.cpp
index 94a041385..30a7e58d5 100644
--- a/src/knotholder.cpp
+++ b/src/knotholder.cpp
@@ -234,9 +234,14 @@ KnotHolder::knot_ungrabbed_handler(SPKnot */*knot*/, guint)
             else
                 object_verb = SP_VERB_SELECTION_DYNAMIC_OFFSET;
         }
-
-        DocumentUndo::done(object->document, object_verb,
-                           _("Move handle"));
+        if (object) { //increasingly aggressive sanity checks
+            if (object->document) {
+                if (object_verb <= SP_VERB_LAST && object_verb >= SP_VERB_INVALID) {
+                    DocumentUndo::done(object->document, object_verb,
+                                       _("Move handle"));
+                }
+            }
+        } //else { abort(); }
     }
 }
 
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