If a hamster eats a pencil eraser will he be ok?

Are you absolutely sure she ate it, and didn't just pouch it and then spit it out later? Hams are generally fairly good at knowing what is and is not edible. A while ago I thought my hamster had eaten part of a wooden necklace, but it turns out she'd actually pouched it as I found it in her bedding when I next cleaned her cage out (why she wanted it I have no idea).