diff --git a/pilosa.go b/pilosa.go
index 9188deaf4..a05228087 100644
--- a/pilosa.go
+++ b/pilosa.go
@@ -105,11 +105,6 @@ func NewBadRequestError(err error) BadRequestError {
 	return BadRequestError{err}
 }
 
-// Cause satisfies the error causer interface
-func (e BadRequestError) Cause() error {
-	return e.error
-}
-
 // ConflictError wraps an error value to signify that a conflict with an
 // existing resource occurred such that in an HTTP scenario, http.StatusConflict
 // would be returned.
@@ -122,11 +117,6 @@ func newConflictError(err error) ConflictError {
 	return ConflictError{err}
 }
 
-// Cause satisfies the error causer interface
-func (e ConflictError) Cause() error {
-	return e.error
-}
-
 // NotFoundError wraps an error value to signify that a resource was not found
 // such that in an HTTP scenario, http.StatusNotFound would be returned.
 type NotFoundError error
@@ -145,11 +135,6 @@ func newPreconditionFailedError(err error) PreconditionFailedError {
 	return PreconditionFailedError{err}
 }
 
-// Cause satisfies the error causer interface
-func (e PreconditionFailedError) Cause() error {
-	return e.error
-}
-
 // Regular expression to validate index and field names.
 var nameRegexp = regexp.MustCompile(`^[a-z][a-z0-9_-]{0,229}$`)
 
diff --git a/server/grpc.go b/server/grpc.go
index c2c24864d..13c9303f5 100644
--- a/server/grpc.go
+++ b/server/grpc.go
@@ -68,7 +68,7 @@ func errToStatusError(err error) error {
 	}
 
 	// Check error string.
-	switch errors.Cause(err) {
+	switch cause := errors.Cause(err); cause {
 	case pilosa.ErrIndexNotFound,
 		pilosa.ErrFieldNotFound,
 		pilosa.ErrForeignIndexNotFound,
@@ -123,6 +123,10 @@ func errToStatusError(err error) error {
 		pilosa.ErrTooManyWrites,
 		pilosa.ErrNodeIDNotExists:
 		return status.Error(codes.Internal, err.Error())
+	default:
+		if _, ok := cause.(pilosa.ConflictError); ok {
+			return status.Error(codes.AlreadyExists, err.Error())
+		}
 	}
 
 	return status.Error(codes.Unknown, err.Error())