Shake Shack (SHAK) reported earnings that beat expectations; however, revenue and same-store sales fell short of Wall Street estimates, sending its stock reeling.

Following the results, shares of the burger chain, which closed Monday’s trading up nearly 2% at $84.30 — tanked by more than 12% in after-hour trading. Shake Shack shares opened Tuesday’s session down more than 17%.

Here were the numbers for Shake Shack’s third quarter, compared to Bloomberg-compiled estimates:

• Revenue: $157.8 million vs. $157.92 million expected

• Adjusted earnings per share: 26 cents vs. 21 cents expected

• Same-store sales: +2% vs. +2.9% expected

The burger chain boosted its full-year revenue guidance and now expects between $592 million to $597 million, up from the previously expected $585 million to $590 million. However, Shack Shack slashed its same-store sales growth expectations for the full year. It now anticipates 1.5% growth, down from the previously expected 2% growth.

“This has been the biggest development year in Shack history as we’ve grown our presence around the country and internationally in the new markets of Mainland China, Singapore, the Philippines and Mexico,” CEO Randy Garutti said in a statement.

“In 2020, we will continue to expand even further within key domestic and international markets. Overall, we continue to execute this year’s plan while gearing up for the key strategic initiatives of 2020,” Garutti said. “We’ll be focused more than ever on putting our people first, simplifying and supporting our operations, and enhancing our winning guest experience."

Third quarter restaurant level operating margin was 23.1% and missed analysts’ expectations for 25.8% year over year. Shake Shack said that higher food costs related to the Chick’n Bites contributed to the decreased profit margin.

Shake Shack’s third quarter results come on the heels of a strong second quarter. The company beat on both the top and bottom lines, and same-store sales were also better than Wall Street estimates. The company also boosted its full-year revenue guidance.

Last quarter, Shake Shack jumped on the delivery bandwagon by partnering up third-party delivery service provider Grubhub (GRUB). The burger chain announced the new partnership early August and updated investors on the company’s earnings call that nearly all Shake Shack locations now offer delivery through Grubhub exclusively. In the fourth quarter, Shake Shack will be phasing out its delivery integration with DoorDash, Caviar and Postmates.

Management said that the exclusive Grubhub partnership will likely pressure sales for some time. “We believe the transition to Grubhub caused some noise in our Q3 numbers and will certainly have an impact through the fourth quarter and into next year. As we remove direct point-of-sale integrations with DoorDash, Postmates and Caviar, we expect an impact to our delivery revenue, especially in those regions where Grub may not be the current market leader,” Garutti said on the conference call. “Any difference in pricing, placement or regional strength in non-Grub marketplaces will affect our sales for a period of time. How much volatility this will cause during this transitional period is uncertain, but the reality is this represents short- to mid-term revenue risk.”