Commit: c06bed25c70cb80657447e510890b29ceb6bbc1b
Author: Antonioya
Date:   Wed Aug 1 10:17:05 2018 +0200
Branches: blender2.8
https://developer.blender.org/rBc06bed25c70cb80657447e510890b29ceb6bbc1b

Fix T56187: Crash using cursor tool in Edit/Sculpt and Weight Paint mode

The transform tried to calculate the multiframe falloff, but there was not any 
stroke to do that.

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

M       source/blender/editors/transform/transform.c

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

diff --git a/source/blender/editors/transform/transform.c 
b/source/blender/editors/transform/transform.c
index b0de996ee0e..85229ddd041 100644
--- a/source/blender/editors/transform/transform.c
+++ b/source/blender/editors/transform/transform.c
@@ -4636,7 +4636,12 @@ static void applyTranslationValue(TransInfo *t, const 
float vec[3])
                        if (t->options & CTX_GPENCIL_STROKES) {
                                /* grease pencil multiframe falloff */
                                bGPDstroke *gps = (bGPDstroke *)td->extra;
-                               mul_v3_fl(tvec, td->factor * 
gps->runtime.multi_frame_falloff);
+                               if (gps != NULL) {
+                                       mul_v3_fl(tvec, td->factor * 
gps->runtime.multi_frame_falloff);
+                               }
+                               else {
+                                       mul_v3_fl(tvec, td->factor);
+                               }
                        }
                        else {
                                /* proportional editing falloff */

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