Add guard for `nil` in our `RateLimiter`.

lib/rate_limiter.rb

@@ -83,7 +83,10 @@ class RateLimiter
   def performed!
     return if rate_unlimited?
     now = Time.now.to_i
-    if max <= 0 || (eval_lua(PERFORM_LUA, PERFORM_LUA_SHA, [prefixed_key], [now, @secs, @max]) == 0)
+
+    if ((max || 0) <= 0) ||
+       (eval_lua(PERFORM_LUA, PERFORM_LUA_SHA, [prefixed_key], [now, @secs, @max]) == 0)
+
       raise RateLimiter::LimitExceeded.new(seconds_to_wait, @type)
     end
   rescue Redis::CommandError => e

spec/components/rate_limiter_spec.rb

@@ -96,7 +96,7 @@ describe RateLimiter do
     context 'max is less than or equal to zero' do
 
       it 'should raise the right error' do
-        [-1, 0].each do |max|
+        [-1, 0, nil].each do |max|
           expect do
             RateLimiter.new(user, "a", max, 60).performed!
           end.to raise_error(RateLimiter::LimitExceeded)