diff --git a/src/validation.cpp b/src/validation.cpp
index e92cbf1b8..5696684ed 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -3267,6 +3267,7 @@ static bool ContextualCheckBlock(const CBlock& block, CValidationState& state, c
     // Start enforcing BIP113 (Median Time Past) using versionbits logic.
     int nLockTimeFlags = 0;
     if (VersionBitsState(pindexPrev, consensusParams, Consensus::DEPLOYMENT_CSV, versionbitscache) == ThresholdState::ACTIVE) {
+        assert(pindexPrev != nullptr);
         nLockTimeFlags |= LOCKTIME_MEDIAN_TIME_PAST;
     }