White spots on the dough while it was rising

Yesterday I was trying to make Croissant. I started by making the dough that contained yeast as the rising agent, and after mixing all of the ingredients I left it to rise at room temperature.

After 2 hours when I checked it out I found that there were white spots on the dough, and they are similar to the spots forming on breads when they go bad.

It was very similar to this image except that the small spots in the image are flour but in my dough it were, I guess, fungal things.

I didn’t know what exactly it was or whether to continue the rising process or not, but I decided to wrap it and put it in the freezer until I know what to do.

By the way, I discovered that I forgot to add sugar (which was in the recipe) to the dough before allowing it to rise), and still I didn’t add it, could this be a factor?

Do you have any idea what are those white spots and are they harmful? And what should I do with the dough in my freezer?

Thanks in advance!