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-rw-r--r--src/main.cpp8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/main.cpp b/src/main.cpp
index f0aa3022cd..8dd61a3720 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3232,6 +3232,14 @@ void static CheckBlockIndex()
LOCK(cs_main);
+ // During a reindex, we read the genesis block and call CheckBlockIndex before ActivateBestChain,
+ // so we have the genesis block in mapBlockIndex but no active chain. (A few of the tests when
+ // iterating the block tree require that chainActive has been initialized.)
+ if (chainActive.Height() < 0) {
+ assert(mapBlockIndex.size() <= 1);
+ return;
+ }
+
// Build forward-pointing map of the entire block tree.
std::multimap<CBlockIndex*,CBlockIndex*> forward;
for (BlockMap::iterator it = mapBlockIndex.begin(); it != mapBlockIndex.end(); it++) {