diff --git a/lib/obsws/event.rb b/lib/obsws/event.rb
index 5bf9c59..d618c0e 100644
--- a/lib/obsws/event.rb
+++ b/lib/obsws/event.rb
@@ -42,7 +42,7 @@ module OBSWS
       end
 
       def add_observer(observer)
-        observer = [observer] if !observer.respond_to? :each
+        observer = [observer] unless observer.respond_to? :each
         observer.each { |o| observers << o unless observers.include? o }
       end
 
diff --git a/lib/obsws/req.rb b/lib/obsws/req.rb
index f4670ae..ca916bd 100644
--- a/lib/obsws/req.rb
+++ b/lib/obsws/req.rb
@@ -47,12 +47,12 @@ module OBSWS
           delay_sec: 0.001,
           timeout_sec: 3
         ) { @response[:requestId] == id }
-        if !@response[:requestStatus][:result]
+        unless @response[:requestStatus][:result]
           error = [
             "Request #{@response[:requestType]} returned code #{@response[:requestStatus][:code]}"
           ]
           if @response[:requestStatus].key?(:comment)
-            error += ["With message: #{@response[:requestStatus][:comment]}"]
+            error << ["With message: #{@response[:requestStatus][:comment]}"]
           end
           raise OBSWSError.new(error.join("\n"))
         end