Fix invalid access to unknown element

This prevents JS error when the website only has one author.

1 files changed, 14 insertions, 4 deletions

diff --git a/assets/js/collapseAuthors.js b/assets/js/collapseAuthors.js
index c52bddd..a9ec2fd 100644
--- a/assets/js/collapseAuthors.js
+++ b/assets/js/collapseAuthors.js
@@ -1,12 +1,22 @@
 let collapsed = true;
 
-document.getElementById("collapsedCoauthors").addEventListener("click", displayCoauthors);
-document.getElementById("uncollapsedAction").addEventListener("click", hideCoauthors);
-
 function displayCoauthors(){
     document.getElementById("uncollapsedCoauthors").classList.remove("hidden");
 }
 
 function hideCoauthors(){
     document.getElementById("uncollapsedCoauthors").classList.add("hidden");
-}
\ No newline at end of file
+}
+
+function bindCollapseAuthors() {
+    const collapsedCoauthorsElement = document.getElementById("collapsedCoauthors");
+
+    if (collapsedCoauthorsElement === null) {
+        return;
+    }
+
+    collapsedCoauthorsElement.addEventListener("click", displayCoauthors);
+    document.getElementById("uncollapsedAction").addEventListener("click", hideCoauthors);
+}
+
+bindCollapseAuthors();