nope..
especially if it's indica.
indicas can take cold as cool as 34 degrees F without trippin too much... they can tae a frost or two as long as it's not a 28 degree frost... but after the first frost you will definitely notice a difference in the growth pattern. as long as it gets warm again they will finish.
50 degrees isnt enough to cause this, 50 at night is what I consider a normal temp, since the past 2-3 months has been nothing but 50 at night 80-90 in the day.