Undefined index: css_class

same problem after the update

It's to do with PHP7 warning on things that work fine in PHP~5.6. e.g. $x = $arr['y'] in PHP~5.6 works fine regardless of if 'y' is a valid key or not (it'll just return NULL if it's not a valid key). In 7 you get warnings.

I've attached a patch that seems to work on my end.

One other (much more minor) issue - does the code really need to do $block->getConfiguration() so much? It sets $configuration = $block->getConfiguration() first thing, so why not just use that instead of calling the method over and over?

This warning occurs because the newest version of context module has additional CSS class option on each block configuration form. I created a patch, which updates all blocks configurations and adds CSS class setting to it. You will need to run drush updb, to update the blocks configurations and then all warnings should disappear.

I agree with @icurk, let's just write an update hook that will solve blocks added in previous versions of Context. The one above is working just fine.

The point is that this value will always be there, it's the new feature that we added and it only affects blocks that were added before the update.

As this is a major issue, I will also create new release (beta2), so you'll be able to update without patching. And of course, you need to run updb, as @icurk already mentioned.

@George Bills: you can create a separate issue for the minor issue you mentioned in your comment and write a patch for it.

Great job! beta2 without any error ! thx