diff --git a/view-plan.php b/view-plan.php
index 6f34042..6a3d8b0 100644
--- a/view-plan.php
+++ b/view-plan.php
@@ -32,11 +32,11 @@ elseif($contextid > 0)
 else
 {
 	// If no context is selected, find the first available one
-	$available_contexts = courseservice::list_used_categories("view");
+	$available_contexts = courseservice::list_accessible_categories_with_usage("view");
 	$contextid=1; // fallback to system context
 	foreach($available_contexts as $ctx){
-		if($ctx["studyplancount"] > 0){
-			$contextid = $ctx["context_id"];
+		if($ctx->count > 0){
+			$contextid = $ctx->ctxid;
 			break;
 		}
 	}