Undefined index: in taxonomy_entity_query_alter()

I am trying to get to the bottom of the following error :

• Notice : Undefined index: [vocabulary] in taxonomy_entity_query_alter() (line 2048 in /modules/taxonomy/taxonomy.module).
• Notice : Trying to get property of non-object in taxonomy_entity_query_alter() (line 2048 in /modules/taxonomy/taxonomy.module).

I've searched around and all I could find was this #1994270: Operator in entityCondition breaks taxonomy_entity_query_alter, but since I have not programmatically modified anything, I am thinking this module could be the culprit

Whenever I save a node that has taxonomy term reference, the error is produced, even though there are no conditions on the field.

Anyone able to replicate?