diff --git a/src/validationinterface.cpp b/src/validationinterface.cpp
index 57f6468c4..4836530ac 100644
--- a/src/validationinterface.cpp
+++ b/src/validationinterface.cpp
@@ -179,6 +179,13 @@ void ThreadNotifyWallets(CBlockIndex *pindexLastTip)
             // Read block from disk.
             CBlock block;
             if (!ReadBlockFromDisk(block, pindexLastTip,1)) {
+                if (IsInitialBlockDownload()) {
+                    // During IBD, block data may not be flushed to disk yet.
+                    // Sleep briefly and retry on the next cycle instead of crashing.
+                    LogPrintf("%s: block at height %d not yet readable, will retry\n",
+                              __func__, pindexLastTip->GetHeight());
+                    break;
+                }
                 LogPrintf("*** %s\n", "Failed to read block while notifying wallets of block disconnects");
                 uiInterface.ThreadSafeMessageBox(
                     _("Error: A fatal internal error occurred, see debug.log for details"),
@@ -206,6 +213,14 @@ void ThreadNotifyWallets(CBlockIndex *pindexLastTip)
             // Read block from disk.
             CBlock block;
             if (!ReadBlockFromDisk(block, blockData.pindex, 1)) {
+                if (IsInitialBlockDownload()) {
+                    // During IBD, block data may not be flushed to disk yet.
+                    // Push unprocessed blocks back and retry on the next cycle.
+                    LogPrintf("%s: block at height %d not yet readable, will retry\n",
+                              __func__, blockData.pindex->GetHeight());
+                    blockStack.push_back(blockData);
+                    break;
+                }
                 LogPrintf("*** %s\n", "Failed to read block while notifying wallets of block connects");
                 uiInterface.ThreadSafeMessageBox(
                     _("Error: A fatal internal error occurred, see debug.log for details"),