diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 04be874..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,15 +0,0 @@
-dist: xenial
-language: go
-
-go:
-  - "1.12"
-
-jobs:
-  include:
-    - name: "Unit Tests 64 bit arch"
-      env: GOARCH="amd64"
-    - name: "Unit Test 32 bit arch"
-      env: GOARCH="386"
-
-env:
-  - GO111MODULE=on
diff --git a/mimc7/mimc7.go b/mimc7/mimc7.go
index ed3114f..d510ac1 100644
--- a/mimc7/mimc7.go
+++ b/mimc7/mimc7.go
@@ -137,7 +137,7 @@ func Hash(arr []*big.Int, key *big.Int) (*big.Int, error) {
 
 // HashBytes hashes a msg byte slice by blocks of 31 bytes encoded as
 // little-endian
-func HashBytes(b []byte) (*big.Int, error) {
+func HashBytes(b []byte) *big.Int {
 	n := 31
 	bElems := make([]*big.Int, 0, len(b)/n+1)
 	for i := 0; i < len(b)/n; i++ {
@@ -150,5 +150,9 @@ func HashBytes(b []byte) (*big.Int, error) {
 		utils.SetBigIntFromLEBytes(v, b[(len(b)/n)*n:])
 		bElems = append(bElems, v)
 	}
-	return Hash(bElems, nil)
+	h, err := Hash(bElems, nil)
+	if err != nil {
+		panic(err)
+	}
+	return h
 }
diff --git a/mimc7/mimc7_test.go b/mimc7/mimc7_test.go
index 2d8e85c..c11de17 100644
--- a/mimc7/mimc7_test.go
+++ b/mimc7/mimc7_test.go
@@ -74,8 +74,7 @@ func TestMIMC7(t *testing.T) {
 	assert.Equal(t, "0x"+hex.EncodeToString((*big.Int)(h4).Bytes()), "0x284bc1f34f335933a23a433b6ff3ee179d682cd5e5e2fcdd2d964afa85104beb")
 
 	msg := []byte("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.")
-	hmsg, err := HashBytes(msg)
-	assert.Nil(t, err)
+	hmsg := HashBytes(msg)
 	assert.Equal(t, "16855787120419064316734350414336285711017110414939748784029922801367685456065", hmsg.String())
 }
 
diff --git a/poseidon/poseidon.go b/poseidon/poseidon.go
index 4a04de0..5ac37cd 100644
--- a/poseidon/poseidon.go
+++ b/poseidon/poseidon.go
@@ -179,7 +179,7 @@ func Hash(arr []*big.Int) (*big.Int, error) {
 
 // HashBytes hashes a msg byte slice by blocks of 31 bytes encoded as
 // little-endian
-func HashBytes(b []byte) (*big.Int, error) {
+func HashBytes(b []byte) *big.Int {
 	n := 31
 	bElems := make([]*big.Int, 0, len(b)/n+1)
 	for i := 0; i < len(b)/n; i++ {
@@ -193,5 +193,9 @@ func HashBytes(b []byte) (*big.Int, error) {
 		utils.SetBigIntFromLEBytes(v, b[(len(b)/n)*n:])
 		bElems = append(bElems, v)
 	}
-	return Hash(bElems)
+	h, err := Hash(bElems)
+	if err != nil {
+		panic(err)
+	}
+	return h
 }
diff --git a/poseidon/poseidon_test.go b/poseidon/poseidon_test.go
index 8b59cba..a3e5ee7 100644
--- a/poseidon/poseidon_test.go
+++ b/poseidon/poseidon_test.go
@@ -73,8 +73,7 @@ func TestPoseidon(t *testing.T) {
 	assert.Nil(t, err)
 	assert.Equal(t, "2978613163687734485261639854325792381691890647104372645321246092227111432722", hmsg2.String())
 
-	hmsg2, err = HashBytes(msg2)
-	assert.Nil(t, err)
+	hmsg2 = HashBytes(msg2)
 	assert.Equal(t, "2978613163687734485261639854325792381691890647104372645321246092227111432722", hmsg2.String())
 }