Fixed #21707 -- Added helpful error message when using {{ block.super }} in base template.

Thanks mitar for the suggestion.

1 files changed, 5 insertions, 0 deletions

diff --git a/django/template/loader_tags.py b/django/template/loader_tags.py
index 77508a7663..1480e5e193 100644
--- a/django/template/loader_tags.py
+++ b/django/template/loader_tags.py
@@ -68,6 +68,11 @@ class BlockNode(Node):
         return result
 
     def super(self):
+        if not hasattr(self, 'context'):
+            raise TemplateSyntaxError(
+                "'%s' object has no attribute 'context'. Did you use "
+                "{{ block.super }} in a base template?" % self.__class__.__name__
+            )
         render_context = self.context.render_context
         if (BLOCK_CONTEXT_KEY in render_context and
                 render_context[BLOCK_CONTEXT_KEY].get_block(self.name) is not None):