Added error handling at auto convert

Author: eunwoo1104

discord_slash/client.py

@@ -249,7 +249,11 @@ async def process_options(self, guild: discord.Guild, options: list, auto_conver
             return [x["value"] for x in options]
         if not auto_convert:
             return [x["value"] for x in options]
-        converters = [guild.fetch_member, guild.get_channel, guild.get_role]
+        converters = [
+            [guild.get_member, guild.fetch_member],
+            guild.get_channel,
+            guild.get_role]
+
         types = {
             "user": 0,
             "USER": 0,
@@ -274,9 +278,19 @@ async def process_options(self, guild: discord.Guild, options: list, auto_conver
                     to_return.append(selected["value"])
                     continue
                 loaded_converter = converters[types[auto_convert[selected["name"]]]]
-                to_return.append(await loaded_converter(int(selected["value"]))) \
-                    if iscoroutinefunction(loaded_converter) else \
-                    to_return.append(loaded_converter(int(selected["value"])))
+                if isinstance(loaded_converter, list):
+                    cache_first = loaded_converter[0](int(selected["value"]))
+                    if cache_first:
+                        to_return.append(cache_first)
+                        continue
+                    loaded_converter = loaded_converter[1]
+                try:
+                    to_return.append(await loaded_converter(int(selected["value"]))) \
+                        if iscoroutinefunction(loaded_converter) else \
+                        to_return.append(loaded_converter(int(selected["value"])))
+                except (discord.Forbidden, discord.HTTPException):
+                    self.logger.warning("Failed fetching user! Passing ID instead.")
+                    to_return.append(int(selected["value"]))
         return to_return
 
     async def on_socket_response(self, msg):