[Bug] TypeError and Uncaught Error in Promise

[ZoeS17]

TypeError: promise.then is not a function
Stack trace:
wrapPromise/<@resource://gre/modules/ExtensionCommon.jsm:523:9
N@moz-extension://17d040b8-b94c-4e77-add3-ac830ef149e9/injected-content/injected-content.js:39:104654
wrapPromise@resource://gre/modules/ExtensionCommon.jsm:522:14
callAsyncFunction@resource://gre/modules/ExtensionCommon.jsm:737:12
stub@resource://gre/modules/Schemas.jsm:2300:22
q/t/<@moz-extension://17d040b8-b94c-4e77-add3-ac830ef149e9/injected-content/injected-content.js:39:271035
l@moz-extension://17d040b8-b94c-4e77-add3-ac830ef149e9/injected-content/injected-content.js:39:149298
c/o._invoke@moz-extension://17d040b8-b94c-4e77-add3-ac830ef149e9/injected-content/injected-content.js:39:149088
x/</t[e]@moz-extension://17d040b8-b94c-4e77-add3-ac830ef149e9/injected-content/injected-content.js:39:149717
l@moz-extension://17d040b8-b94c-4e77-add3-ac830ef149e9/injected-content/injected-content.js:39:238022
s@moz-extension://17d040b8-b94c-4e77-add3-ac830ef149e9/injected-content/injected-content.js:39:238228
u/</<@moz-extension://17d040b8-b94c-4e77-add3-ac830ef149e9/injected-content/injected-content.js:39:238287
N@moz-extension://17d040b8-b94c-4e77-add3-ac830ef149e9/injected-content/injected-content.js:39:104654
u/<@moz-extension://17d040b8-b94c-4e77-add3-ac830ef149e9/injected-content/injected-content.js:39:238169
q@moz-extension://17d040b8-b94c-4e77-add3-ac830ef149e9/injected-content/injected-content.js:39:270898
@moz-extension://17d040b8-b94c-4e77-add3-ac830ef149e9/injected-content/injected-content.js:39:274334
@moz-extension://17d040b8-b94c-4e77-add3-ac830ef149e9/injected-content/injected-content.js:39:274323
l@moz-extension://17d040b8-b94c-4e77-add3-ac830ef149e9/injected-content/injected-content.js:39:25648
Deferred/then/s/</u<@moz-extension://17d040b8-b94c-4e77-add3-ac830ef149e9/injected-content/injected-content.js:39:25952

Browser: 60.8.0esr (64-bit)
OS: Linux 4.18.0-kali2-amd64 #1 SMP Debian 4.18.10-2kali1 (2018-10-09) x86_64 GNU/Linux
MixrElixr Version: 2.3.1
I tried to use this Add-on on the mixer.com/{Channel} and on mixer.com/embed/chat/{ChannelID} and recieved the above error in the Console followed by the bellow error:

Error: Uncaught (in promise): Event: {"isTrusted":true}
Stack trace:
O@https://mixer.com/_latest/bundles/polyfill.en-US-869cbdc3fee79ed1ebae.bundle.js?46493fb44d9fff0fe27a:8:12943
O@https://mixer.com/_latest/bundles/polyfill.en-US-869cbdc3fee79ed1ebae.bundle.js?46493fb44d9fff0fe27a:8:12501
M/<@https://mixer.com/_latest/bundles/polyfill.en-US-869cbdc3fee79ed1ebae.bundle.js?46493fb44d9fff0fe27a:8:13766
c</e.prototype.invokeTask@https://mixer.com/_latest/bundles/polyfill.en-US-869cbdc3fee79ed1ebae.bundle.js?46493fb44d9fff0fe27a:8:7679
onInvokeTask@https://mixer.com/_latest/bundles/main.en-US-f7e2f0ef67ab8f2c023a.bundle.js?46493fb44d9fff0fe27a:202:1986
c</e.prototype.invokeTask@https://mixer.com/_latest/bundles/polyfill.en-US-869cbdc3fee79ed1ebae.bundle.js?46493fb44d9fff0fe27a:8:7592
a</t.prototype.runTask@https://mixer.com/_latest/bundles/polyfill.en-US-869cbdc3fee79ed1ebae.bundle.js?46493fb44d9fff0fe27a:8:2849
m@https://mixer.com/_latest/bundles/polyfill.en-US-869cbdc3fee79ed1ebae.bundle.js?46493fb44d9fff0fe27a:8:9974
u</t.invokeTask@https://mixer.com/_latest/bundles/polyfill.en-US-869cbdc3fee79ed1ebae.bundle.js?46493fb44d9fff0fe27a:8:8826
y@https://mixer.com/_latest/bundles/polyfill.en-US-869cbdc3fee79ed1ebae.bundle.js?46493fb44d9fff0fe27a:39:629
b@https://mixer.com/_latest/bundles/polyfill.en-US-869cbdc3fee79ed1ebae.bundle.js?46493fb44d9fff0fe27a:39:873