From 1e4988bf20b9ea0176b54c052b88b608bb09a3f2 Mon Sep 17 00:00:00 2001
From: Orne Brocaar <info@brocaar.com>
Date: Mon, 11 Oct 2021 12:57:26 +0100
Subject: [PATCH] Do not lookup from errToCode map when error is of type slice.

Closes #631.
---
 internal/api/helpers/errors.go | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/internal/api/helpers/errors.go b/internal/api/helpers/errors.go
index 4c8059e29..d77a4969e 100644
--- a/internal/api/helpers/errors.go
+++ b/internal/api/helpers/errors.go
@@ -1,6 +1,8 @@
 package helpers
 
 import (
+	"reflect"
+
 	"github.com/pkg/errors"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
@@ -45,6 +47,13 @@ func ErrToRPCError(err error) error {
 		return cause
 	}
 
+	// Some error values (error returned by Otto) can not be hashed:
+	// https://github.com/brocaar/chirpstack-application-server/issues/631
+	k := reflect.TypeOf(cause).Kind()
+	if k == reflect.Slice {
+		return grpc.Errorf(codes.Unknown, cause.Error())
+	}
+
 	code, ok := errToCode[cause]
 	if !ok {
 		code = codes.Unknown