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h2/src/main/org/h2/store/FileLock.java

@@ -398,12 +398,14 @@ public class FileLock {
     private SQLException error(String reason) {
         JdbcSQLException ex = Message.getSQLException(ErrorCode.DATABASE_ALREADY_OPEN_1, reason);
         String payload = null;
+        if (fileName != null) {
             try {
                 Properties prop = load();
                 payload = prop.getProperty("server") + "/" + prop.getProperty("id");
             } catch (SQLException e) {
                 // ignore
             }
+        }
         ex.setPayload(payload);
         return ex;
     }