It was not a good day for Dollar Tree, Inc. (DLTR) investors, as shares fell 14.5% to $89.25 on Wednesday.

The company missed on earnings per share and revenue results. However, guidance was a disappointment, too, TheStreet's Jim Cramer said on CNBC's "Mad Dash" segment.

Management expects first-quarter earnings of $1.18 per share to $1.25 per share, below consensus expectations calling for $1.31. Revenue guidance was roughly in-line for the quarter, although management's midpoint guide of $5.58 billion was slightly below consensus estimates of $5.6 billion.

Cramer also pointed out the company's inability to successfully integrate its Family Dollar acquisition, noting that the unit only produced same-store sales growth of 1%.

However, the stock's pounding is somewhat "quizzical," Cramer reasoned. That's because the company also provided full-year guidance that came in strong. In fact, both revenue and earnings forecasts came in ahead of estimates.

So it's puzzling how the company feels it will have a weak first quarter and will ultimately follow that up with a strong full year.

In that light, the stock's selloff seem like an overreaction, said Cramer, who also manages the Action Alerts PLUS charitable trust portfolio.

Despite some of these issues, Dollar Tree is a "really good company," Cramer said. While the guidance took him by surprise, it appears to be an overreaction.

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