AUSTIN, Texas (CBSDFW.COM/AP) – Democratic gubernatorial candidate Lupe Valdez owes $12,000-plus in overdue property taxes on seven properties, a previously unreported shortfall.

The Houston Chronicle reports that Valdez’s campaign acknowledges that she owes back property taxes, but is paying them back in installments. The full amount isn’t due until January.

In a statement Thursday, Valdez campaign spokesman Juan Bautista Dominguez said it was an example of property taxes being “unpredictable and burdensome for Texans everywhere,” and blamed Abbott’s lack of leadership on the issue.

 Here is the full statement:

“As we’ve been saying all along, under Greg Abbott’s failed leadership, property taxes are unpredictable and burdensome for Texans everywhere, including Sheriff Lupe Valdez. Sheriff Valdez has made arrangements to payoff 2017 property taxes and plans to do so entirely in the coming months. In previous years, she had made similar arrangements and fulfilled them.” 

Lupe Valdez wins Democratic Primary runoff (CBS11)

Valdez, a former Dallas County sheriff, won a primary runoff Tuesday to become Texas’ first openly gay and Hispanic gubernatorial candidate.

She’s set to take on incumbent Republican Governor Greg Abbott in November.

Texas hasn’t elected a Democratic governor since 1990.

(© Copyright 2018 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)