tq_mutate problem

[fibrou]

tq_mutate() is generating an intermittent error when mutating downloaded symbols from an index.

dowSymbols <- tq_index("DOW") %>%
  select(symbol)
 
dowReturns <- tq_get(dowSymbols, from = "2017-01-01", to = "2022-12-31") %>%
   group_by(symbol) %>%
   tq_mutate(select = adjusted, periodReturn, period = "daily", type = "arithmetic")

The traceback error indicates the following:

Error in merge_two_tibbles(tib1 = data, tib2 = ret, mutate_fun) : Could not join. Incompatible structures.

6. stop("Could not join. Incompatible structures.")
5. merge_two_tibbles(tib1 = data, tib2 = ret, mutate_fun)
4. tq_mutate_.tbl_df(data = data, select = lazyeval::expr_text(select), mutate_fun = lazyeval::expr_text(mutate_fun), col_rename = col_rename, ... = ...)
3. tq_mutate_(data = data, select = lazyeval::expr_text(select), mutate_fun = lazyeval::expr_text(mutate_fun), col_rename = col_rename, ... = ...)
2. tq_mutate(., select = adjusted, periodReturn, period = "daily", type = "arithmetic")
1. tq_get(dowSymbols, from = "2017-01-01", to = "2022-12-31") %>% group_by(symbol) %>% tq_mutate(select = adjusted, periodReturn, period = "daily", type = "arithmetic")

Any sense as to what might be happening with tq-mutate()?