diff --git a/packages/common/src/chains/goerli.json b/packages/common/src/chains/goerli.json
index 294ead7016..bad5da82bb 100644
--- a/packages/common/src/chains/goerli.json
+++ b/packages/common/src/chains/goerli.json
@@ -75,7 +75,7 @@
       "//_comment": "The forkHash will remain same as mergeForkIdTransition is post merge, terminal block: https://goerli.etherscan.io/block/7382818",
       "name": "merge",
       "ttd": "10790000",
-      "block": 7382819,
+      "block": null,
       "forkHash": "0xb8c6299d"
     },
     {
diff --git a/packages/common/src/chains/mainnet.json b/packages/common/src/chains/mainnet.json
index 48579fe0b0..e8d5ae715c 100644
--- a/packages/common/src/chains/mainnet.json
+++ b/packages/common/src/chains/mainnet.json
@@ -91,7 +91,7 @@
       "//_comment": "The forkHash will remain same as mergeForkIdTransition is post merge, terminal block: https://etherscan.io/block/15537393",
       "name": "merge",
       "ttd": "58750000000000000000000",
-      "block": 15537394,
+      "block": null,
       "forkHash": "0xf0afd0e3"
     },
     {
diff --git a/packages/common/src/chains/sepolia.json b/packages/common/src/chains/sepolia.json
index 8c74c5b442..4d7821ec2e 100644
--- a/packages/common/src/chains/sepolia.json
+++ b/packages/common/src/chains/sepolia.json
@@ -77,7 +77,7 @@
       "//_comment": "The forkHash will remain same as mergeForkIdTransition is post merge, terminal block: https://sepolia.etherscan.io/block/1450408",
       "name": "merge",
       "ttd": "17000000000000000",
-      "block": 1450409,
+      "block": null,
       "forkHash": "0xfe3366e7"
     },
     {
diff --git a/packages/common/src/common.ts b/packages/common/src/common.ts
index 24256ccae2..fd33ddb7d2 100644
--- a/packages/common/src/common.ts
+++ b/packages/common/src/common.ts
@@ -314,6 +314,7 @@ export class Common extends EventEmitter {
       hfIndex = hfs.length - 1
     } else if (hfIndex === 0) {
       // Cant move back, ideally we should throw??
+      throw Error('No hardfork qualitifies')
     } else {
       // The previous hardfork is the candidate here
       hfIndex = hfIndex - 1
diff --git a/packages/common/tests/hardforks.spec.ts b/packages/common/tests/hardforks.spec.ts
index bb73b51b3b..211384e7a4 100644
--- a/packages/common/tests/hardforks.spec.ts
+++ b/packages/common/tests/hardforks.spec.ts
@@ -63,6 +63,36 @@ tape('[Common]: Hardfork logic', function (t: tape.Test) {
     st.end()
   })
 
+  t.test('should throw if no hardfork qualifies', function (st) {
+    const hardforks = [
+      {
+        name: 'homestead',
+        block: 3,
+      },
+      {
+        name: 'tangerineWhistle',
+        block: 3,
+      },
+      {
+        name: 'spuriousDragon',
+        block: 3,
+      },
+    ]
+    const c = Common.custom({ hardforks }, { baseChain: Chain.Sepolia })
+
+    try {
+      c.getHardforkByBlockNumber(0)
+      t.fail('should have thrown since no hardfork should quality')
+    } catch (e) {
+      t.pass('throw since no hardfork qualifies')
+    }
+
+    const msg = 'should return correct value'
+    st.equal(c.setHardforkByBlockNumber(3), Hardfork.SpuriousDragon, msg)
+
+    t.end()
+  })
+
   t.test('setHardfork(): hardforkChanged event', function (st) {
     const c = new Common({ chain: Chain.Mainnet, hardfork: Hardfork.Istanbul })
     c.on('hardforkChanged', (hardfork: string) => {