diff --git a/src/llmq/instantsend.cpp b/src/llmq/instantsend.cpp
index 4785d0ae80..4486fc8f96 100644
--- a/src/llmq/instantsend.cpp
+++ b/src/llmq/instantsend.cpp
@@ -1737,7 +1737,7 @@ bool CInstantSendManager::IsInstantSendMempoolSigningEnabled() const
 
 bool CInstantSendManager::RejectConflictingBlocks() const
 {
-    if (!masternodeSync->IsBlockchainSynced()) {
+    if (masternodeSync == nullptr || !masternodeSync->IsBlockchainSynced()) {
         return false;
     }
     if (!spork_manager.IsSporkActive(SPORK_3_INSTANTSEND_BLOCK_FILTERING)) {