diff --git a/core/blockchain_test.go b/core/blockchain_test.go
index e201df414..ac748319f 100644
--- a/core/blockchain_test.go
+++ b/core/blockchain_test.go
@@ -2408,6 +2408,9 @@ func TestProcessingStateDiffs(t *testing.T) {
 
 	moreBlocks := makeBlockChain(blocks[len(blocks)-1], 1, engine, db, canonicalSeed)
 	_, err = blockchain.InsertChain(moreBlocks)
+	if err != nil {
+		t.Error(err)
+	}
 
 	//a root hash can be dereferenced when it's state diff and it's child's state diff have been processed
 	//(i.e. it has a count of 2 in stateDiffsProcessed)
diff --git a/statediff/testhelpers/mocks/api_test.go b/statediff/testhelpers/mocks/api_test.go
index 89e51db08..886372691 100644
--- a/statediff/testhelpers/mocks/api_test.go
+++ b/statediff/testhelpers/mocks/api_test.go
@@ -166,6 +166,9 @@ func testHTTPAPI(t *testing.T) {
 		streamBlock: true,
 	}
 	payload, err := mockService.StateDiffAt(block1.Number().Uint64())
+	if err != nil {
+		t.Error(err)
+	}
 	expectedBlockRlp, _ := rlp.EncodeToBytes(block1)
 	if !bytes.Equal(payload.BlockRlp, expectedBlockRlp) {
 		t.Errorf("payload does not have expected block\r\actual block rlp: %v\r\nexpected block rlp: %v", payload.BlockRlp, expectedBlockRlp)
diff --git a/statediff/types.go b/statediff/types.go
index 3bfb598a5..95aef777d 100644
--- a/statediff/types.go
+++ b/statediff/types.go
@@ -64,8 +64,8 @@ func (sd *Payload) Encode() ([]byte, error) {
 
 // StateDiff is the final output structure from the builder
 type StateDiff struct {
-	BlockNumber     *big.Int      `json:"blockNumber"	  gencodec:"required"`
-	BlockHash       common.Hash   `json:"blockHash" 	  gencodec:"required"`
+	BlockNumber     *big.Int      `json:"blockNumber"     gencodec:"required"`
+	BlockHash       common.Hash   `json:"blockHash"       gencodec:"required"`
 	CreatedAccounts []AccountDiff `json:"createdAccounts" gencodec:"required"`
 	DeletedAccounts []AccountDiff `json:"deletedAccounts" gencodec:"required"`
 	UpdatedAccounts []AccountDiff `json:"updatedAccounts" gencodec:"required"`
@@ -76,7 +76,7 @@ type StateDiff struct {
 
 // AccountDiff holds the data for a single state diff node
 type AccountDiff struct {
-	Leaf    bool          `json:"leaf"	      gencodec:"required"`
+	Leaf    bool          `json:"leaf"        gencodec:"required"`
 	Key     []byte        `json:"key"         gencodec:"required"`
 	Value   []byte        `json:"value"       gencodec:"required"`
 	Proof   [][]byte      `json:"proof"       gencodec:"required"`
@@ -86,7 +86,7 @@ type AccountDiff struct {
 
 // StorageDiff holds the data for a single storage diff node
 type StorageDiff struct {
-	Leaf  bool     `json:"leaf"	       gencodec:"required"`
+	Leaf  bool     `json:"leaf"        gencodec:"required"`
 	Key   []byte   `json:"key"         gencodec:"required"`
 	Value []byte   `json:"value"       gencodec:"required"`
 	Proof [][]byte `json:"proof"       gencodec:"required"`