add check for missing user

server/src/database/sqlite.ts

@@ -89,7 +89,7 @@ export class SQLiteAdapter extends Database {
     public async getUser(email: string): Promise<any> {
         return new Promise((resolve, reject) => {
             db.get(`SELECT * FROM authentication WHERE email = ?`, [email], (err: any, row: any) => {
-                if (err) {
+                if (err || !row) {
                     reject(err);
                     console.log(`[database:sqlite] failed to get user ${email}`);
                 } else {