title: Trying to arrange two gganimate plots throws error: Error in magick_image_info(image) : rsession.exe: Invalid geometry argument
body: <p>I am trying to arrange to gganimate plots side by side. All the code executes, but when I call the resultant gif I get the following error:</p>
  <pre><code>Error in magick_image_info(image) : 
    rsession.exe: Invalid geometry argument
  </code></pre>
  <p>Searching for that error, I get no results on google.</p>
  <p>I can't pull together a full reproducible example as the df's underlying the two animations are large. Below is the code that I use to try and arrange the two animations together. Note that both the individual animations run fine on their own.</p>
  <pre><code>#load libraries
  library('ggplot')
  library('gganimate')
  library('magick')
  
  #create the first animation
  a &lt;- ggplot(df, aes(...)) +
  ... #rest of ggplot call
   transition_time(year)
  #create the second animation
  a2 &lt;- ggplot(df, aes(...)) +
  ... #rest of ggplot call
  transition_reveal(year)
  
  #Render the animations
  #The value of of length(unique(df$year)) is the same across both calls
  anim1 &lt;- animate(a, nframes = length(unique(df$year)), fps = 3)
  anim2 &lt;- animate(a2, nframes = length(unique(df$year)), fps = 3)
  
  #Convert the gifs to magick objects
  anim1_magic &lt;- image_read(anim1)
  anim2_magic &lt;- image_read(anim2)
  
  #Combine the magick objects into a single gif
  #This code completes without an error
  anim1_2 &lt;- image_append(c(anim1_magic[1], anim2_magic[1]), stack = F)
  for(i in 2:length(unique(berk_records$year)) - 12) {
    combined &lt;- image_append(c(anim1_magic[i], anim2_magic[i]))
    anim1_2 &lt;- c(anim1_2, combined)
  }
  
  #display the combined animation
  anim1_2
  </code></pre>
  <p>Throws error:</p>
  <pre><code>Error in magick_image_info(image) : 
    rsession.exe: Invalid geometry argument
  </code></pre>
  <p>I can try and <code>dput</code> some data if that would be helpful, but if anyone can see what the issue is here, that would be very much appreciated.</p>