diff -r b0b2a512d017 src/org/openbravo/service/system/SystemService.java
--- a/src/org/openbravo/service/system/SystemService.java	Sun Mar 12 12:06:39 2017 +0100
+++ b/src/org/openbravo/service/system/SystemService.java	Sun Mar 12 13:14:06 2017 +0100
@@ -168,7 +168,9 @@
         sb.append(err);
       }
     }
-    log.error(sb.toString());
+    if (sb.length() > 0) {
+      log.error(sb.toString());
+    }
     return sb.toString();
   }