ggalluvial breaks with thematic_on

[elfatherbrown]

The problem

using thematic_on() breaks a ggalluvial plot.

Also posted there. Probably there is a way to only post it once and refference, but I dont know how.

library(ggalluvial)
#> Loading required package: ggplot2
#Works!
ggplot(as.data.frame(Titanic),
       aes(y = Freq,
           axis1 = Class, axis2 = Sex, axis3 = Age,
           fill = Survived)) +
    geom_alluvium() +
    scale_x_discrete(limits = c("Class", "Sex", "Age"))

# :(
# Sniff.... 
thematic::thematic_on("black","lightgray",accent="white")
#> This version of thematic is designed to work with rmarkdown version 2.6.6 or higher. Consider upgrading via remotes::install_github('rstudio/rmarkdown')
ggplot(as.data.frame(Titanic),
       aes(y = Freq,
           axis1 = Class, axis2 = Sex, axis3 = Age,
           fill = Survived)) +
    geom_alluvium() +
    scale_x_discrete(limits = c("Class", "Sex", "Age"))
#> Error in col2rgb(color, alpha = TRUE): numerical color values must be positive

#... :~(

^{Created on 2021-02-25 by the reprex package (v1.0.0)}

Session Info

─ Session info ─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
 setting  value                       
 version  R version 3.6.3 (2020-02-29)
 os       Ubuntu 20.04.2 LTS          
 system   x86_64, linux-gnu           
 ui       RStudio                     
 language (EN)                        
 collate  en_US.UTF-8                 
 ctype    en_US.UTF-8                 
 tz       America/Mazatlan            
 date     2021-02-25                  
─ Packages ─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

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knitr         1.28    2020-02-06 [3] CRAN (R 3.6.2)

magrittr      2.0.1   2020-11-17 [1] CRAN (R 3.6.3)

memoise       1.1.0   2017-04-21 [3] CRAN (R 3.5.0)

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reprex        1.0.0   2021-01-27 [1] CRAN (R 3.6.3)

rlang         0.4.10  2020-12-30 [1] CRAN (R 3.6.3)

rmarkdown     2.1     2020-01-20 [3] CRAN (R 3.6.2)

rprojroot     2.0.2   2020-11-15 [1] CRAN (R 3.6.3)

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usethis       1.5.1   2019-07-04 [3] CRAN (R 3.6.2)

withr         2.4.1   2021-01-26 [1] CRAN (R 3.6.3)

xfun          0.12    2020-01-13 [3] CRAN (R 3.6.2)

yaml          2.2.1   2020-02-01 [3] CRAN (R 3.6.2)
[1] /home/alex/R/x86_64-pc-linux-gnu-library/3.6

[2] /usr/local/lib/R/site-library

[3] /usr/lib/R/site-library

[4] /usr/lib/R/library