diff --git a/backend/src/api/blocks.ts b/backend/src/api/blocks.ts
index f258fefea..53a2ce1ac 100644
--- a/backend/src/api/blocks.ts
+++ b/backend/src/api/blocks.ts
@@ -295,7 +295,7 @@ class Blocks {
     extras.virtualSize = block.weight / 4.0;
     if (coinbaseTx?.vout.length > 0) {
       extras.coinbaseAddress = coinbaseTx.vout[0].scriptpubkey_address ?? null;
-      extras.coinbaseAddresses = [...new Set<string>(...coinbaseTx.vout.map(v => v.scriptpubkey_address).filter(a => a) as string[])];
+      extras.coinbaseAddresses = [...new Set<string>(coinbaseTx.vout.map(v => v.scriptpubkey_address).filter(a => a) as string[])];
       extras.coinbaseSignature = coinbaseTx.vout[0].scriptpubkey_asm ?? null;
       extras.coinbaseSignatureAscii = transactionUtils.hex2ascii(coinbaseTx.vin[0].scriptsig) ?? null;
     } else {
diff --git a/backend/src/repositories/BlocksRepository.ts b/backend/src/repositories/BlocksRepository.ts
index b2e4b0f11..b2737b46d 100644
--- a/backend/src/repositories/BlocksRepository.ts
+++ b/backend/src/repositories/BlocksRepository.ts
@@ -40,7 +40,7 @@ interface DatabaseBlock {
   avgFeeRate: number;
   coinbaseRaw: string;
   coinbaseAddress: string;
-  coinbaseAddresses: string[];
+  coinbaseAddresses: string;
   coinbaseSignature: string;
   coinbaseSignatureAscii: string;
   avgTxSize: number;
@@ -163,7 +163,7 @@ class BlocksRepository {
         block.mediantime,
         block.extras.header,
         block.extras.coinbaseAddress,
-        block.extras.coinbaseAddresses,
+        block.extras.coinbaseAddresses ? JSON.stringify(block.extras.coinbaseAddresses) : null,
         truncatedCoinbaseSignature,
         block.extras.utxoSetSize,
         block.extras.utxoSetChange,
@@ -1040,7 +1040,7 @@ class BlocksRepository {
     extras.avgFeeRate = dbBlk.avgFeeRate;
     extras.coinbaseRaw = dbBlk.coinbaseRaw;
     extras.coinbaseAddress = dbBlk.coinbaseAddress;
-    extras.coinbaseAddresses = dbBlk.coinbaseAddresses;
+    extras.coinbaseAddresses = dbBlk.coinbaseAddresses ? JSON.parse(dbBlk.coinbaseAddresses) : [];
     extras.coinbaseSignature = dbBlk.coinbaseSignature;
     extras.coinbaseSignatureAscii = dbBlk.coinbaseSignatureAscii;
     extras.avgTxSize = dbBlk.avgTxSize;