fixes #3944

Closes #3944

Merge request studip/studip!2803

lib/models/OERMaterial.php

@@ -172,7 +172,7 @@ class OERMaterial extends SimpleORMap
                     $host->fetchRemoteSearch($text, $tag);
                 }
             }
-            StudipCacheFactory::getCache()->read($cache_name, "1", 60);
+            StudipCacheFactory::getCache()->write($cache_name, "1", 60);
         }
     }