diff --git a/modules/type/blocks/dap_chain_cs_blocks.c b/modules/type/blocks/dap_chain_cs_blocks.c
index 645f24c40b03c8500f9889a0bdcc19ba240da1ed..7949f0ed486a49dc338248a28c906d56120e2e59 100644
--- a/modules/type/blocks/dap_chain_cs_blocks.c
+++ b/modules/type/blocks/dap_chain_cs_blocks.c
@@ -850,6 +850,8 @@ static void s_callback_cs_blocks_purge(dap_chain_t *a_chain)
     }
     pthread_rwlock_unlock(&PVT(l_blocks)->rwlock);
     dap_chain_block_chunks_delete(PVT(l_blocks)->chunks);
+    PVT(l_blocks)->block_cache_last = NULL;
+    PVT(l_blocks)->block_cache_first = NULL;
     PVT(l_blocks)->chunks = dap_chain_block_chunks_create(l_blocks);
 }