diff --git a/mamweb/settings_common.py b/mamweb/settings_common.py
index 3f9edab6..54e0c6f1 100644
--- a/mamweb/settings_common.py
+++ b/mamweb/settings_common.py
@@ -10,6 +10,8 @@ https://docs.djangoproject.com/en/1.7/ref/settings/
 
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
 import os
+import traceback
+
 BASE_DIR = os.path.dirname(os.path.dirname(__file__))
 
 # Application definition
@@ -344,7 +346,10 @@ class InvalidTemplateVariable(str):
     def __mod__(self, variable):
         import logging
         logger = logging.getLogger(__name__)
-        logger.warning("Proměnná '%s' neexistuje" % variable)
+        for line in traceback.walk_stack(None):
+            if 'context' in line[0].f_locals and 'request' in line[0].f_locals['context']:
+                logger.warning("Proměnná '%s' neexistuje: %s" % (variable, line[0].f_locals['context']['request']))
+                break
         return ''
 TEMPLATES[0]['OPTIONS']['string_if_invalid'] = InvalidTemplateVariable('%s')