diff --git a/cieloApi3/request/base.py b/cieloApi3/request/base.py
index 3b8cd4d..763e005 100644
--- a/cieloApi3/request/base.py
+++ b/cieloApi3/request/base.py
@@ -36,7 +36,13 @@ def send_request(self, method, uri, data=None, params=None):
 
         response = s.send(prep)
 
-        if 'json' in response.headers['Content-Type'].lower():
+        try:
+            is_json = 'json' in response.headers['Content-Type'].lower()
+        except KeyError:
+            # Content type not in response.headers
+            is_json = False
+
+        if is_json:
             answers = response.json()
         else:
             answers = [{
@@ -44,6 +50,7 @@ def send_request(self, method, uri, data=None, params=None):
                 'Message': response.text
             }]
 
+
         if response.status_code >= 400:
             errors = []