diff --git a/lib/file_manticore_api.php b/lib/file_manticore_api.php
--- a/lib/file_manticore_api.php
+++ b/lib/file_manticore_api.php
@@ -106,7 +106,7 @@
                 $request->setConfig($http_config);
             }
             catch (Exception $e) {
-                rcube::log_error("HTTP: " . $e->getMessage());
+                rcube::raise_error("HTTP: " . $e->getMessage(), true, false);
             }
         }
 
diff --git a/lib/file_ui_api.php b/lib/file_ui_api.php
--- a/lib/file_ui_api.php
+++ b/lib/file_ui_api.php
@@ -100,7 +100,7 @@
                 $request->setConfig($http_config);
             }
             catch (Exception $e) {
-//                rcube::log_error("HTTP: " . $e->getMessage());
+                //rcube::raise_error("HTTP: " . $e->getMessage(), true, false);
             }
         }
 
diff --git a/lib/file_wopi.php b/lib/file_wopi.php
--- a/lib/file_wopi.php
+++ b/lib/file_wopi.php
@@ -271,7 +271,7 @@
                 $request->setConfig($http_config);
             }
             catch (Exception $e) {
-                rcube::log_error("HTTP: " . $e->getMessage());
+                rcube::raise_error("HTTP: " . $e->getMessage(), true, false);
             }
         }