1 files changed, 3 insertions, 0 deletions
diff --git a/packages/backend/src/misc/render-inline-error.ts b/packages/backend/src/misc/render-inline-error.ts
index ccd4f524bc..07f9f3068e 100644
--- a/packages/backend/src/misc/render-inline-error.ts
+++ b/packages/backend/src/misc/render-inline-error.ts
@@ -34,6 +34,9 @@ function renderTo(err: unknown, parts: string[]): void {
 }
 
 function printError(err: unknown): string {
+	if (err === undefined) return 'undefined';
+	if (err === null) return 'null';
+
 	if (err instanceof IdentifiableError) {
 		if (err.message) {
 			return `${err.name} ${err.id}: ${err.message}`;