The core prestige class Dragon Disciple has the following requirement:
Spellcasting: Ability to cast 1st-level arcane spells without preparation. If the character has sorcerer levels, he must have the draconic bloodline. If the character gains levels of sorcerer after taking this class, he must take the draconic bloodline.
The first-level power Blood of Dragons includes the following text::
If the dragon disciple does not have levels of sorcerer, he instead gains bloodline powers of the draconic bloodline, using his dragon disciple level as his sorcerer level to determine the bonuses gained.
When I add the Dragon Disciple level, the Summary tab tells me that there are too many bloodlines selected, and when I click it, it jumps to where I selected the Aberrant Bloodline. Since we're talking about a Bloodrager here and not a Sorcerer, this shouldn't be happening.