diff --git a/mamweb/settings_common.py b/mamweb/settings_common.py
index ce028bc2..5b7b257b 100644
--- a/mamweb/settings_common.py
+++ b/mamweb/settings_common.py
@@ -336,3 +336,16 @@ CISLO_IMG_DIR = os.path.join('cislo', 'img')
 
 # E-MAIL NOTIFICATIONS
 POSLI_MAILOVOU_NOTIFIKACI = False
+
+
+
+# Logování chyb
+class InvalidTemplateVariable(str):
+    def __mod__(self, variable):
+        import logging
+        logger = logging.getLogger(__name__)
+        logger.warning("Proměnná '%s' neexistuje" % variable)
+        return ''
+TEMPLATES[0]['OPTIONS']['string_if_invalid'] = InvalidTemplateVariable('%s')
+
+
diff --git a/mamweb/templates/base.html b/mamweb/templates/base.html
index 85cb9e12..c5c12271 100644
--- a/mamweb/templates/base.html
+++ b/mamweb/templates/base.html
@@ -6,7 +6,7 @@
     <title>{% block title %}{% block nadpis1a %}{% endblock %} – Korespondenční seminář M&amp;M{% endblock title %}</title>
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <link rel="shortcut icon" href="{% static 'images/MATFYZ_MM_barevne.svg' %}" type="image/x-icon">
-    {% render_block css %}
+{#    {% render_block css %}#}
     {% block custom_css %}{% endblock %}
     <link href="{% static 'css/bootstrap-theme.css' %}" rel="stylesheet">
     <link href="{% static 'css/bootstrap.css' %}" rel="stylesheet">