Make sure pindexWalk is non-null

6 years ago · 5298d41fae
1 changed files with 2 additions and 1 deletions
--- a/src/chain.cpp
+++ b/src/chain.cpp
@ -81,7 +81,8 @@ CBlockIndex* CBlockIndex::GetAncestor(int height)

    CBlockIndex* pindexWalk = this;
    int heightWalk = nHeight;
-    while (heightWalk > height) {
+    while ( heightWalk > height && pindexWalk != 0 )
+    {
        int heightSkip = GetSkipHeight(heightWalk);
        int heightSkipPrev = GetSkipHeight(heightWalk - 1);
        if (pindexWalk->pskip != NULL &&