diff --git a/src/structures/GuildMember.js b/src/structures/GuildMember.js
index bcad0e03e..0c096120d 100644
--- a/src/structures/GuildMember.js
+++ b/src/structures/GuildMember.js
@@ -394,7 +394,7 @@ class GuildMember {
    */
   addRole(role) {
     if (!(role instanceof Role)) role = this.guild.roles.get(role);
-    if (!role) throw new TypeError('Supplied parameter was neither a Role nor a Snowflake.');
+    if (!role) return Promise.reject(new TypeError('Supplied parameter was neither a Role nor a Snowflake.'));
     return this.client.rest.methods.addMemberRole(this, role);
   }
 
@@ -421,7 +421,7 @@ class GuildMember {
    */
   removeRole(role) {
     if (!(role instanceof Role)) role = this.guild.roles.get(role);
-    if (!role) throw new TypeError('Supplied parameter was neither a Role nor a Snowflake.');
+    if (!role) return Promise.reject(new TypeError('Supplied parameter was neither a Role nor a Snowflake.'));
     return this.client.rest.methods.removeMemberRole(this, role);
   }