diff --git a/handler.php b/handler.php
index a7bc736..397b0a3 100644
--- a/handler.php
+++ b/handler.php
@@ -41,9 +41,16 @@ else if (isset($_POST['action']))
 		break;
 
 		case 'cal':
-			$result = array();
-			$result["ics"] = file_get_contents($icsfile);
-			echo json_encode($result);
+			if (file_exists($icsfile))
+			{
+				$result = array();
+				$result["ics"] = file_get_contents($icsfile);
+				echo json_encode($result);
+			}
+			else
+			{
+				echo '{"warning": "cannot load ics file"}';
+			}
 		break;
 
 		default:
diff --git a/main.js b/main.js
index da607c4..cf9b3d1 100644
--- a/main.js
+++ b/main.js
@@ -1449,6 +1449,10 @@ function queryremote(params)
 							failed("Remote handler returned an error: " + data.error);
 						}
 					}
+					else if (data.warning)
+					{
+						console.warn("Remote warning: " + data.warning);
+					}
 					else
 					{
 						authentpage.hidden = true;
@@ -2271,7 +2275,6 @@ function editorkeydown()
 		else
 		{
 			newtext = selection.replaceAll("\n", "\n    ");
-
 		}
 		md.value = md.value.substring(0, range.start)
 		+ newtext