diff --git a/src/app/resource/controllers/LinkController.php b/src/app/resource/controllers/LinkController.php
index 1e41de713f50b5debd8c52ba9c39b3b46d4f491c..866955941fe3b4d1b3e6847e2b0bb80d70f9eb4e 100644
--- a/src/app/resource/controllers/LinkController.php
+++ b/src/app/resource/controllers/LinkController.php
@@ -97,7 +97,10 @@ class LinkController
                     $linkedResources[$key]['visaCircuit'][$keyCircuit]['userLabel'] = UserModel::getLabelledUserById(['id' => $valueCircuit['item_id']]);
                 }
 
-                $linkedResources[$key]['canConvert'] = ConvertPdfController::canConvert(['extension' => $value['format']]);
+                $linkedResources[$key]['canConvert'] = false;
+                if (!empty($value['format'])) {
+                    $linkedResources[$key]['canConvert'] = ConvertPdfController::canConvert(['extension' => $value['format']]);
+                }
             }
         }