diff --git a/app/src/Model/Table/PermissionsTable.php b/app/src/Model/Table/PermissionsTable.php
index 39931da9..53c6b73e 100644
--- a/app/src/Model/Table/PermissionsTable.php
+++ b/app/src/Model/Table/PermissionsTable.php
@@ -99,9 +99,20 @@ public function buildRules(RulesChecker $rules): RulesChecker {
    */
   
   public function findForUser(string $username) {
-    return $this->find('list', ['keyField' => 'matchgrid_id', 'valueField' => 'permission'])
-                ->where(['username' => $username])
-                ->toArray();
+    // As of Cake 4.6 (or maybe 4.5) find('list') keyField can't have null values,
+    // so we manually assemble the result to an array and assign the platform a pseudo
+    // identifier of -1.
+    $perms = $this->find()
+                  ->where(['username' => $username])
+                  ->all();
+    
+    $ret = [];
+
+    foreach($perms as $p) {
+      $ret[ $p->matchgrid_id ?? -1 ] = $p->permission;
+    }
+
+    return $ret;
   }
 
   /**