diff --git a/data/txt/sha256sums.txt b/data/txt/sha256sums.txt
index d0f0cd55e..c9c8f2fbd 100644
--- a/data/txt/sha256sums.txt
+++ b/data/txt/sha256sums.txt
@@ -110,7 +110,7 @@ c94d5c9ae4e4b996eaf0d06a6c5323a12f22653bb53c5eaf5400ee0bccf4a1eb  doc/translatio
 6d690c314fe278f8f949b27cd6f7db0354732c6112f2c8f764dcf7c2d12d626f  doc/translations/README-tr-TR.md
 0bccce9d2e48e7acc1ef126539a50d3d83c439f94cc6387c1331a9960604a2cd  doc/translations/README-uk-UA.md
 b88046e2fc27c35df58fcd5bbeaec0d70d95ebf3953f2cf29cc97a0a14dad529  doc/translations/README-vi-VN.md
-8b68be42ae66a805c7ecd01d14d36b0153c5acafa436d7f941caa014e31f9aef  doc/translations/README-zh-CN.md
+b553a179c731127a115d68dfb2342602ad8558a42aa123050ba51a08509483f6  doc/translations/README-zh-CN.md
 98dd22c14c12ba65ca19efca273ef1ef07c45c7832bfd7daa7467d44cb082e76  extra/beep/beep.py
 509276140d23bfc079a6863e0291c4d0077dea6942658a992cbca7904a43fae9  extra/beep/beep.wav
 99d0e94dd5fe60137abf48bfa051129fb251f5c40f0f7a270c89fbcb07323730  extra/beep/__init__.py
@@ -165,7 +165,7 @@ f9c96cd3fe99578bed9d49a8bdf8d76836d320a7c48c56eb0469f48b36775c35  lib/controller
 99d0e94dd5fe60137abf48bfa051129fb251f5c40f0f7a270c89fbcb07323730  lib/controller/__init__.py
 826c33f1105be4c0985e1bbe1d75bdb009c17815ad6552fc8d9bf39090d3c40f  lib/core/agent.py
 b2d69c99632da5c2acd0c0934e70d55862f1380a3f602cbe7456d617fb9c1fc9  lib/core/bigarray.py
-66e09a503381482d9807a14c3bfb18a2f22c2b176127a8e5fce2a131c21bdfac  lib/core/common.py
+e4a608db78251ab01154f210f68023e0963721852abc9eea82ee0f087e6dcea2  lib/core/common.py
 5c26b0f308266bc3a9679ef837439e38d1dc7a69eac6bd3422280f49aaf114d2  lib/core/compat.py
 b60c96780cad4a257f91a0611b08cfcc52f242908c5d5ab2bf9034ef07869602  lib/core/convert.py
 5e381515873e71c395c77df00bf1dd8c4592afc6210a2f75cbc20daf384e539f  lib/core/data.py
@@ -187,7 +187,7 @@ bf77f9fc4296f239687297aee1fd6113b34f855965a6f690b52e26bd348cb353  lib/core/profi
 4eff81c639a72b261c8ba1c876a01246e718e6626e8e77ae9cc6298b20a39355  lib/core/replication.py
 bbd1dcda835934728efc6d68686e9b0da72b09b3ee38f3c0ab78e8c18b0ba726  lib/core/revision.py
 eed6b0a21b3e69c5583133346b0639dc89937bd588887968ee85f8389d7c3c96  lib/core/session.py
-b42288a6ebdf71f86fcc38399fdf9a2bbad9ffe71e94657b73ae5eba27a5f060  lib/core/settings.py
+9ce5e85152ffb3a499325cd00b45bf33eaa7a0c79814993a3de55e474423efc7  lib/core/settings.py
 2bec97d8a950f7b884e31dfe9410467f00d24f21b35672b95f8d68ed59685fd4  lib/core/shell.py
 e90a359b37a55c446c60e70ccd533f87276714d0b09e34f69b0740fd729ddbf8  lib/core/subprocessng.py
 54f7c70b4c7a9931f7ff3c1c12030180bde38e35a306d5e343ad6052919974cd  lib/core/target.py
diff --git a/lib/core/common.py b/lib/core/common.py
index eb59f7939..70641e399 100644
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -252,6 +252,10 @@ class Format(object):
         if versions is None and Backend.getVersionList():
             versions = Backend.getVersionList()
 
+        # NOTE: preventing ugly (e.g.) "back-end DBMS: MySQL Unknown"
+        if isListLike(versions) and UNKNOWN_DBMS_VERSION in versions:
+            versions = None
+
         return Backend.getDbms() if versions is None else "%s %s" % (Backend.getDbms(), " and ".join(filterNone(versions)))
 
     @staticmethod
diff --git a/lib/core/settings.py b/lib/core/settings.py
index 43a3cfb63..da4323d0b 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -20,7 +20,7 @@ from thirdparty import six
 from thirdparty.six import unichr as _unichr
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.8.3.12"
+VERSION = "1.8.3.13"
 TYPE = "dev" if VERSION.count('.') > 2 and VERSION.split('.')[-1] != '0' else "stable"
 TYPE_COLORS = {"dev": 33, "stable": 90, "pip": 34}
 VERSION_STRING = "sqlmap/%s#%s" % ('.'.join(VERSION.split('.')[:-1]) if VERSION.count('.') > 2 and VERSION.split('.')[-1] == '0' else VERSION, TYPE)