From ca0372c4157cb0b121b3aacac47445185173a8a0 Mon Sep 17 00:00:00 2001
From: John <johndygit@live.com.ph>
Date: Fri, 15 Apr 2016 08:34:15 +0800
Subject: [PATCH] Fix insert operation.

Handle case where move is unnecessary.
---
 spine-c/src/spine/Skeleton.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/spine-c/src/spine/Skeleton.c b/spine-c/src/spine/Skeleton.c
index 162988e47..77e396807 100644
--- a/spine-c/src/spine/Skeleton.c
+++ b/spine-c/src/spine/Skeleton.c
@@ -169,8 +169,10 @@ void spSkeleton_updateCache (const spSkeleton* self) {
 			if (updatable == transformConstraint->bone || updatable == transformConstraint->target) {
 				int insertIndex = ii + 1;
 				int moveCount = (capacity-2) - insertIndex;
-				memmove(internal->updateCache + (insertIndex+1), internal->updateCache + insertIndex, moveCount * sizeof(void*));
-				memmove(internal->updateCacheType + (insertIndex+1), internal->updateCacheType + insertIndex, moveCount * sizeof(_spUpdateType));
+				if (moveCount > 0) {
+					memmove(internal->updateCache + (insertIndex + 1), internal->updateCache + insertIndex, moveCount * sizeof(void*));
+					memmove(internal->updateCacheType + (insertIndex + 1), internal->updateCacheType + insertIndex, moveCount * sizeof(_spUpdateType));
+				}
 				internal->updateCacheCount++;
 				internal->updateCache[insertIndex] = transformConstraint;
 				internal->updateCacheType[insertIndex] = SP_UPDATE_TRANSFORM_CONSTRAINT;