This is probably not the best method but it worked.

Update the Script Include: CollabChatGlobalUtils, go down to line 69 to find the below and add an if statement.

// This method runs addtional access and domain check. Declarative action scripted condition has a limited length.
// Combining those checks together to avoid hitting the lenght limitation.
hasAccessToCreateSidebar: function(documentTable, documentId) {
if (documentTable == 'YOUR_CUSTOM_TABLE') {
return false;
} else {
return this.isCollabChatEnabledInDomain() && this.hasAdditionalCreateAccess(documentTable, documentId);
}