fix nil panic in message reaction add handler (#347)

handlers/message_reaction_handler.go

@@ -2,6 +2,7 @@ package handlers
 
 import (
 	"github.com/disgoorg/disgo/bot"
+	"github.com/disgoorg/disgo/discord"
 	"github.com/disgoorg/disgo/events"
 	"github.com/disgoorg/disgo/gateway"
 )
@@ -37,6 +38,11 @@ func gatewayHandlerMessageReactionAdd(client bot.Client, sequenceNumber int, sha
 			MessageAuthorID: event.MessageAuthorID,
 		})
 	} else {
+		var member discord.Member
+		// sometimes the member is nil for some reason
+		if event.Member != nil {
+			member = *event.Member
+		}
 		client.EventManager().DispatchEvent(&events.GuildMessageReactionAdd{
 			GenericGuildMessageReaction: &events.GenericGuildMessageReaction{
 				GenericEvent: genericEvent,
@@ -48,7 +54,7 @@ func gatewayHandlerMessageReactionAdd(client bot.Client, sequenceNumber int, sha
 				BurstColors:  event.BurstColors,
 				Burst:        event.Burst,
 			},
-			Member:          *event.Member,
+			Member:          member,
 			MessageAuthorID: event.MessageAuthorID,
 		})
 	}