Login error when pressing enter

When I tried to login in useing my mojang account and password and pressed enter (While password feild selected), it did nothing, but when I hit "Login" (After pressing enter) I got "Bad Login" alert. The error I found is that the password feild counts it as a input (Like this: password [next line]) but dosent show, which means that it send's "password [next line]" to the servers rather than "password" excludeing the line.