diff --git a/classes/local/hook_callbacks.php b/classes/local/hook_callbacks.php
index 91121f2..c07e204 100644
--- a/classes/local/hook_callbacks.php
+++ b/classes/local/hook_callbacks.php
@@ -50,6 +50,11 @@ class hook_callbacks {
     public static function inject_backlinks_into_activity_header(before_http_headers $beforehttpheadershook): void {
         global $OUTPUT, $PAGE;
 
+        // Don't run during initial install.
+        if (during_initial_install()) {
+            return;
+        }
+
         if (get_config('mod_learningmap', 'backlinkallowed') == 0) {
             return;
         }