Merge #10305: Fix potential NPD introduced in b297426c

70d3945 Fix potential NPD introduced in b297426c (Matt Corallo)

Tree-SHA512: 920d03d2081ba2f3447cfa655dcbc3e17858454dab051436f717ada977d4f4bfe999c303018bc8aa33f30e37a97c63d70ba08632f5e7b7a8aa555615dde2191a

src/validation.cpp

@@ -2538,7 +2538,7 @@ bool ActivateBestChain(CValidationState &state, const CChainParams& chainparams,
     }
 
     int nStopAtHeight = GetArg("-stopatheight", DEFAULT_STOPATHEIGHT);
-    if (nStopAtHeight && pindexNewTip->nHeight >= nStopAtHeight) StartShutdown();
+    if (nStopAtHeight && pindexNewTip && pindexNewTip->nHeight >= nStopAtHeight) StartShutdown();
 
     return true;
 }