diff --git a/code/api/client.py b/code/api/client.py
index 042f7b8..b0ca2b3 100644
--- a/code/api/client.py
+++ b/code/api/client.py
@@ -2,7 +2,7 @@
 from ssl import SSLCertVerificationError
 
 import requests
-from requests.exceptions import SSLError
+from requests.exceptions import SSLError, InvalidHeader
 
 from api.errors import (
     SSLCertificateVerificationFailedError,
@@ -11,6 +11,9 @@
 )
 
 
+AUTHORIZATION_FAILED = "Authorization failed on AlienVault OTX side"
+
+
 class Client:
 
     def __init__(self, key, url, headers=None, params=None):
@@ -38,14 +41,14 @@ def query(self, endpoint, headers=None, params=None):
                 getattr(error, 'verify_message', error.args[0]).capitalize()
             )
             raise SSLCertificateVerificationFailedError(reason=reason)
+        except (InvalidHeader, UnicodeEncodeError):
+            raise AuthenticationRequiredError(reason=AUTHORIZATION_FAILED)
 
         if response.status_code == HTTPStatus.BAD_REQUEST:
             return None
 
         if response.status_code == HTTPStatus.FORBIDDEN:
-            raise AuthenticationRequiredError(
-                reason="Authorization failed on AlienVault OTX side"
-            )
+            raise AuthenticationRequiredError(reason=AUTHORIZATION_FAILED)
 
         if response.status_code == HTTPStatus.NOT_FOUND:
             return None
diff --git a/code/app.py b/code/app.py
index c159dea..1ffa8ef 100644
--- a/code/app.py
+++ b/code/app.py
@@ -1,10 +1,11 @@
+import traceback
+
 from flask import Flask, jsonify
 
 from api.enrich import enrich_api
 from api.health import health_api
 from api.version import version_api
 from api.watchdog import watchdog_api
-
 from api.errors import RelayError
 from api.utils import jsonify_errors
 
@@ -21,13 +22,13 @@
 
 @app.errorhandler(RelayError)
 def handle_relay_error(error):
-    app.logger.error(error.json())
+    app.logger.error(traceback.format_exc())
     return jsonify_errors(error)
 
 
 @app.errorhandler(Exception)
 def handle_error(exception):
-    app.logger.error(exception)
+    app.logger.error(traceback.format_exc())
     code = getattr(exception, 'code', 500)
     message = getattr(exception, 'description', 'Something went wrong.')
     reason = '.'.join([
diff --git a/code/container_settings.json b/code/container_settings.json
index c889bdc..fe111cc 100644
--- a/code/container_settings.json
+++ b/code/container_settings.json
@@ -1,4 +1,4 @@
 {
-  "VERSION": "2.0.3",
+  "VERSION": "2.0.4",
   "NAME": "AlienVault OTX"
 }