Error while exporting plots

## Project Robyn

## Describe issue
Getting a weird error while saving `pareto_alldecomp_matrix.csv`: `>> Exporting general plots into directory...
Failed exporting results, but returned model results anyways:
Error in theme[[element]]: attempt to select more than one element in vectorIndex`

All other files are generated correctly:


## Provide reproducible example

I am using following code:
```
InputCollect <- robyn_inputs(
dt_input = data,
dt_holidays = dt_prophet_holidays,
date_var = date_column, # date format must be "2020-01-01"
dep_var = target_variable, # there should be only one dependent variable
dep_var_type = "conversion", # "revenue" (ROI) or "conversion" (CPA)
prophet_vars = c("trend", "season", "holiday"), # "trend","season", "weekday" & "holiday"
prophet_country = "US", # input country code. Check: dt_prophet_holidays
context_vars = contextual_variables,
paid_media_spends = selected_paid_media_spends,
paid_media_vars = selected_paid_media_vars,
window_start = as.Date(lower_limit_date),
window_end = as.Date(upper_limit_date),
adstock = "geometric", # geometric, weibull_cdf or weibull_pdf.
)
hyperparameters <- create_hyperparameter_ranges(selected_paid_media_spends)
InputCollect <- robyn_inputs(InputCollect = InputCollect, hyperparameters = hyperparameters)

printlog("Running Robyn")
OutputModels <- robyn_run(
InputCollect = InputCollect, # feed in all model specification
cores = NULL, # NULL defaults to (max available - 1)
iterations = 2000, # 2000 recommended for the dummy dataset with no calibration
trials = 5, # 5 recommended for the dummy dataset
ts_validation = TRUE, # 3-way-split time series for NRMSE validation.
add_penalty_factor = TRUE # Experimental feature. Use with caution.
)
plot_folder <- paste0(robyn_directory, job_run_id, '/', state)
dir_exists <- dir.exists(plot_folder)
if (!dir_exists) {
dir.create(plot_folder, recursive = TRUE)
}

printlog("Collecting Robyn Outputs")
OutputCollect <- robyn_outputs(
InputCollect, OutputModels,
pareto_fronts = "auto",
csv_out = "all", # "pareto", "all", or NULL (for none)
clusters = TRUE, # Set to TRUE to cluster similar models by ROAS. See ?robyn_clusters
export = TRUE, # this will create files locally
plot_folder = plot_folder, # path for plots exports and files creation
plot_folder_sub = "",
plot_pareto = FALSE # Set to FALSE to deactivate plotting and saving model one-pagers
)
```

## Environment & Robyn version
Make sure you're using the latest Robyn version before you post an issue.
- Check and share Robyn version: `packageVersion("Robyn")`
- R version (Please, check and share: `sessionInfo()` or `R.version$version.string`)

I can confirm that the Robyn version is: `3.11.1`