diff --git a/main.go b/main.go
index df7b3dbf7cb9348408dba048068617cb583617bd..dfbc8ddd3992883ef7205dc8b38ac60268c7d5e0 100644
--- a/main.go
+++ b/main.go
@@ -68,6 +68,9 @@ }
 
 func fromWeb(did string) string {
 	slog.Debug("converting did:web", slog.String("did", did))
+	if !strings.HasPrefix(did, "did:web:") {
+		return ""
+	}
 	return strings.TrimPrefix(did, "did:web:")
 }
 
@@ -92,10 +95,18 @@ 	return strings.TrimPrefix(plc.AKA[0], "at://"), nil
 }
 
 func didToHandle(rawDID string) (string, error) {
-	if strings.HasPrefix(rawDID, "did:web") {
-		return fromWeb(rawDID), nil
+	web := fromWeb(rawDID)
+	if web != "" {
+		return web, nil
 	}
-	return fromPLC(rawDID)
+	plc, err := fromPLC(rawDID)
+	if err != nil {
+		return "", err
+	}
+	if plc != "" {
+		return plc, nil
+	}
+	return "", fmt.Errorf("could not resolve %q", rawDID)
 }
 
 func maine() error {