diff --git a/src/Plugin/BibCiteProcessor/CiteprocPhpInline.php b/src/Plugin/BibCiteProcessor/CiteprocPhpInline.php
index e9ebd3a..83cc8f4 100644
--- a/src/Plugin/BibCiteProcessor/CiteprocPhpInline.php
+++ b/src/Plugin/BibCiteProcessor/CiteprocPhpInline.php
@@ -62,14 +62,32 @@ class CiteprocPhpInline extends BibCiteProcessorBase implements BibCiteProcessor
    */
   public function render($data, $csl, $lang) {
     $cite_proc = new CiteProc($csl, $lang);
-    $mode = !empty($data['mode']) ? $data['mode'] : NULL;
 
-    if (!$data instanceof \stdClass) {
-      $data = json_decode(json_encode($data));
+    // Default to bibliography when no mode is specified.
+    $mode = !empty($data['mode']) ? $data['mode'] : 'bibliography';
+
+    // CiteProc expects an array of citation objects.
+    if ($data instanceof \stdClass) {
+      $data = [$data];
+    }
+    elseif (is_array($data)) {
+      if (array_is_list($data)) {
+        $data = array_map(
+          static fn($item) => is_array($item)
+            ? json_decode(json_encode($item))
+            : $item,
+          $data
+        );
+      }
+      else {
+        $data = [json_decode(json_encode($data))];
+      }
     }
+
     if (!empty($data)) {
       return $cite_proc->render($data, $mode);
     }
+
     return '';
   }