diff --git a/src/test/validation_flush_tests.cpp b/src/test/validation_flush_tests.cpp
index 7111fc3380..8bac914f05 100644
--- a/src/test/validation_flush_tests.cpp
+++ b/src/test/validation_flush_tests.cpp
@@ -56,7 +56,7 @@ BOOST_AUTO_TEST_CASE(getcoinscachesizestate)
 
     // Without any coins in the cache, we shouldn't need to flush.
     BOOST_CHECK_EQUAL(
-        chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 0),
+        chainstate.GetCoinsCacheSizeState(&tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 0),
         CoinsCacheSizeState::OK);
 
     // If the initial memory allocations of cacheCoins don't match these common
@@ -71,7 +71,7 @@ BOOST_AUTO_TEST_CASE(getcoinscachesizestate)
         }
 
         BOOST_CHECK_EQUAL(
-            chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 0),
+            chainstate.GetCoinsCacheSizeState(&tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 0),
             CoinsCacheSizeState::CRITICAL);
 
         BOOST_TEST_MESSAGE("Exiting cache flush tests early due to unsupported arch");
@@ -92,7 +92,7 @@ BOOST_AUTO_TEST_CASE(getcoinscachesizestate)
         print_view_mem_usage(view);
         BOOST_CHECK_EQUAL(view.AccessCoin(res).DynamicMemoryUsage(), COIN_SIZE);
         BOOST_CHECK_EQUAL(
-            chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 0),
+            chainstate.GetCoinsCacheSizeState(&tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 0),
             CoinsCacheSizeState::OK);
     }
 
@@ -100,26 +100,26 @@ BOOST_AUTO_TEST_CASE(getcoinscachesizestate)
     for (int i{0}; i < 4; ++i) {
         add_coin(view);
         print_view_mem_usage(view);
-        if (chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 0) ==
+        if (chainstate.GetCoinsCacheSizeState(&tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 0) ==
             CoinsCacheSizeState::CRITICAL) {
             break;
         }
     }
 
     BOOST_CHECK_EQUAL(
-        chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 0),
+        chainstate.GetCoinsCacheSizeState(&tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 0),
         CoinsCacheSizeState::CRITICAL);
 
     // Passing non-zero max mempool usage should allow us more headroom.
     BOOST_CHECK_EQUAL(
-        chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 1 << 10),
+        chainstate.GetCoinsCacheSizeState(&tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 1 << 10),
         CoinsCacheSizeState::OK);
 
     for (int i{0}; i < 3; ++i) {
         add_coin(view);
         print_view_mem_usage(view);
         BOOST_CHECK_EQUAL(
-            chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 1 << 10),
+            chainstate.GetCoinsCacheSizeState(&tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 1 << 10),
             CoinsCacheSizeState::OK);
     }
 
@@ -135,7 +135,7 @@ BOOST_AUTO_TEST_CASE(getcoinscachesizestate)
         BOOST_CHECK(usage_percentage >= 0.9);
         BOOST_CHECK(usage_percentage < 1);
         BOOST_CHECK_EQUAL(
-            chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, 1 << 10),
+            chainstate.GetCoinsCacheSizeState(&tx_pool, MAX_COINS_CACHE_BYTES, 1 << 10),
             CoinsCacheSizeState::LARGE);
     }
 
@@ -143,7 +143,7 @@ BOOST_AUTO_TEST_CASE(getcoinscachesizestate)
     for (int i{0}; i < 1000; ++i) {
         add_coin(view);
         BOOST_CHECK_EQUAL(
-            chainstate.GetCoinsCacheSizeState(tx_pool),
+            chainstate.GetCoinsCacheSizeState(&tx_pool),
             CoinsCacheSizeState::OK);
     }
 
@@ -151,7 +151,7 @@ BOOST_AUTO_TEST_CASE(getcoinscachesizestate)
     // preallocated memory that doesn't get reclaimed even after flush.
 
     BOOST_CHECK_EQUAL(
-        chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, 0),
+        chainstate.GetCoinsCacheSizeState(&tx_pool, MAX_COINS_CACHE_BYTES, 0),
         CoinsCacheSizeState::CRITICAL);
 
     view.SetBestBlock(InsecureRand256());
@@ -159,7 +159,7 @@ BOOST_AUTO_TEST_CASE(getcoinscachesizestate)
     print_view_mem_usage(view);
 
     BOOST_CHECK_EQUAL(
-        chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, 0),
+        chainstate.GetCoinsCacheSizeState(&tx_pool, MAX_COINS_CACHE_BYTES, 0),
         CoinsCacheSizeState::CRITICAL);
 }
 
diff --git a/src/validation.cpp b/src/validation.cpp
index 462d8d961b..3cebf1090e 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -2227,7 +2227,7 @@ bool CChainState::ConnectBlock(const CBlock& block, BlockValidationState& state,
     return true;
 }
 
-CoinsCacheSizeState CChainState::GetCoinsCacheSizeState(const CTxMemPool& tx_pool)
+CoinsCacheSizeState CChainState::GetCoinsCacheSizeState(const CTxMemPool* tx_pool)
 {
     return this->GetCoinsCacheSizeState(
         tx_pool,
@@ -2236,11 +2236,11 @@ CoinsCacheSizeState CChainState::GetCoinsCacheSizeState(const CTxMemPool& tx_poo
 }
 
 CoinsCacheSizeState CChainState::GetCoinsCacheSizeState(
-    const CTxMemPool& tx_pool,
+    const CTxMemPool* tx_pool,
     size_t max_coins_cache_size_bytes,
     size_t max_mempool_size_bytes)
 {
-    int64_t nMempoolUsage = tx_pool.DynamicMemoryUsage();
+    const int64_t nMempoolUsage = tx_pool ? tx_pool->DynamicMemoryUsage() : 0;
     int64_t cacheSize = CoinsTip().DynamicMemoryUsage();
     int64_t nTotalSpace =
         max_coins_cache_size_bytes + std::max<int64_t>(max_mempool_size_bytes - nMempoolUsage, 0);
@@ -2279,7 +2279,7 @@ bool CChainState::FlushStateToDisk(
     {
         bool fFlushForPrune = false;
         bool fDoFullFlush = false;
-        CoinsCacheSizeState cache_state = GetCoinsCacheSizeState(::mempool);
+        CoinsCacheSizeState cache_state = GetCoinsCacheSizeState(&::mempool);
         LOCK(cs_LastBlockFile);
         if (fPruneMode && (fCheckForPruning || nManualPruneHeight > 0) && !fReindex) {
             if (nManualPruneHeight > 0) {
diff --git a/src/validation.h b/src/validation.h
index c76edd142a..534162d64a 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -674,11 +674,11 @@ public:
     //! Dictates whether we need to flush the cache to disk or not.
     //!
     //! @return the state of the size of the coins cache.
-    CoinsCacheSizeState GetCoinsCacheSizeState(const CTxMemPool& tx_pool)
+    CoinsCacheSizeState GetCoinsCacheSizeState(const CTxMemPool* tx_pool)
         EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
 
     CoinsCacheSizeState GetCoinsCacheSizeState(
-        const CTxMemPool& tx_pool,
+        const CTxMemPool* tx_pool,
         size_t max_coins_cache_size_bytes,
         size_t max_mempool_size_bytes) EXCLUSIVE_LOCKS_REQUIRED(::cs_main);