Command "If" not currently available

Good day. We have a number of Photoshop actions which resize image files, reducing the pixel value of the long side and using the conditional command to distinguish between images in landscape and portrait orientation. In other words, there's a separate resizing action for both landscape and portrait, and the Master action runs one of these two based on image orientation. Without a discernible pattern, a batch using this action will occasionally fail with the message The command "If" is not currently available. Typically, I've just deleted the conditional action and re-recorded using the two source actions, and then I can complete the batch. I'm curious to know what causes this error and how to avoid it. Any insight from the community would be greatly appreciated! Thanks in advance.