Running examples in 'ggmuller-Ex.R' failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: get_Muller_df
> ### Title: Create a data frame from which to create a Muller plot
> ### Aliases: get_Muller_df
> 
> ### ** Examples
> 
> # by default, all genotypes are included, 
> # but one can choose to omit genotypes with max frequency < cutoff:
> Muller_df <- get_Muller_df(example_edges, example_pop_df, cutoff = 0.01)
> 
> # the genotype names can be arbitrary character strings instead of numbers:
> example_edges_char <- example_edges
> example_edges_char$Identity <- paste0("foo", example_edges_char$Identity, "bar")
> example_edges_char$Parent <- paste0("foo", example_edges_char$Parent, "bar")
> example_pop_df_char <- example_pop_df
> example_pop_df_char$Identity <- paste0("foo", example_pop_df_char$Identity, "bar")
> Muller_df <- get_Muller_df(example_edges_char, example_pop_df_char, cutoff = 0.01)
> 
> # the genotype names can also be factors (which is the default for strings in imported data):
> example_edges_char$Identity <- as.factor(example_edges_char$Identity)
> example_edges_char$Parent <- as.factor(example_edges_char$Parent)
> example_pop_df_char$Identity <- as.factor(example_pop_df_char$Identity)
> Muller_df <- get_Muller_df(example_edges_char, example_pop_df_char, cutoff = 0.01)

 *** caught segfault ***
address (nil), cause 'unknown'

Traceback:
 1: slice_impl(.data, quo)
 2: slice.tbl_df(., 1)
 3: slice(., 1)
 4: function_list[[i]](value)
 5: freduce(value, `_function_list`)
 6: `_fseq`(`_lhs`)
 7: eval(quote(`_fseq`(`_lhs`)), env, env)
 8: eval(quote(`_fseq`(`_lhs`)), env, env)
 9: withVisible(eval(quote(`_fseq`(`_lhs`)), env, env))
10: group_by_(pop_df, ~Identity) %>% filter_(~Population > 0 | Generation ==     max(Generation)) %>% slice(1) %>% arrange_(~Generation) %>%     ungroup()
11: get_Muller_df(example_edges_char, example_pop_df_char, cutoff = 0.01)
An irrecoverable exception occurred. R is aborting now ...
Segmentation fault