Chrysanthemums are an example whose growth patterns and flowering behaviors have been studied extensively by the greenhouse industry. Researchers found that the largest flowers with the highest total weight are grown when the dark-cycle routine is provided each night. When the plants were in darkness only six nights a week, there was a slight diminution of flower size and total weight. With each additional lost night, flower size and weight dropped.

Without consistent dark periods of sufficient light, cannabis buds elongate and grow looser. Every time the dark period of the flowering cycle is interrupted, there is a slight loss of flowering-growing time and thus of yield. A spate of light interruptions of the dark cycle may also stress the plant to the point that it becomes hermaphroditic.
-- Ed Rosenthal's Marijuana's Grower's Handbook

Going by the quote from this book, it sounds like repeated nights of irregular light is more likely to cause hermies and you should be ok from one error. But I haven't even reached flowering stage in my first grow yet so I don't know from experience. You are very knowledgeable in your other posts so I assume your plants are otherwise unstressed, and I bet and hope they will be fine!