message: try logging the stack to see where the TypeError on travis occurs exactly
diff: @@ -147,7 +147,7 @@ class GroupStore extends EventEmitter {
  return;
  }
  - console.error(`Failed to get resource ${stateKey} for ${groupId}`, err);
  + console.error(`Failed to get resource ${stateKey} for ${groupId}`, err.stack);
  this.emit('error', err, groupId);
  }).finally(() => {
  // Indicate finished request, allow for future fetches
  