diff --git a/lib/core/settings.py b/lib/core/settings.py
index 583844a65..378052be8 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -19,7 +19,7 @@ from lib.core.enums import DBMS_DIRECTORY_NAME
 from lib.core.enums import OS
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.2.3.16"
+VERSION = "1.2.3.17"
 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)
diff --git a/lib/techniques/union/test.py b/lib/techniques/union/test.py
index 3d621e898..dee45c66c 100644
--- a/lib/techniques/union/test.py
+++ b/lib/techniques/union/test.py
@@ -142,14 +142,16 @@ def _findUnionCharCount(comment, place, parameter, value, prefix, suffix, where=
 
             elif abs(max_ - min_) >= MIN_STATISTICAL_RANGE:
                     deviation = stdev(ratios)
-                    lower, upper = average(ratios) - UNION_STDEV_COEFF * deviation, average(ratios) + UNION_STDEV_COEFF * deviation
 
-                    if min_ < lower:
-                        retVal = minItem[0]
+                    if deviation is not None:
+                        lower, upper = average(ratios) - UNION_STDEV_COEFF * deviation, average(ratios) + UNION_STDEV_COEFF * deviation
 
-                    if max_ > upper:
-                        if retVal is None or abs(max_ - upper) > abs(min_ - lower):
-                            retVal = maxItem[0]
+                        if min_ < lower:
+                            retVal = minItem[0]
+
+                        if max_ > upper:
+                            if retVal is None or abs(max_ - upper) > abs(min_ - lower):
+                                retVal = maxItem[0]
     finally:
         kb.errorIsNone = popValue()
 
diff --git a/txt/checksum.md5 b/txt/checksum.md5
index 1dcfb0766..a7c5453d1 100644
--- a/txt/checksum.md5
+++ b/txt/checksum.md5
@@ -46,7 +46,7 @@ ffa5f01f39b17c8d73423acca6cfe86a  lib/core/readlineng.py
 0c3eef46bdbf87e29a3f95f90240d192  lib/core/replication.py
 a7db43859b61569b601b97f187dd31c5  lib/core/revision.py
 fcb74fcc9577523524659ec49e2e964b  lib/core/session.py
-a4f32062f445d10c9cb655595beecc78  lib/core/settings.py
+401efa6aae28b56f34420323ac4c2296  lib/core/settings.py
 d0adc28a38e43a787df4471f7f027413  lib/core/shell.py
 63491be462c515a1a3880c27c2acc4a2  lib/core/subprocessng.py
 3cc852f927833895361973fbcfd156d2  lib/core/target.py
@@ -96,7 +96,7 @@ b84d45fc7349caa714f9769b13d70cab  lib/techniques/blind/inference.py
 627ddc86a5a969e5509c7531c5c27a6c  lib/techniques/error/use.py
 1e5532ede194ac9c083891c2f02bca93  lib/techniques/__init__.py
 1e5532ede194ac9c083891c2f02bca93  lib/techniques/union/__init__.py
-e58ab8029ffb2cc37e42d68747c4da39  lib/techniques/union/test.py
+da5a117fb64723e6c815b0e33d50f66a  lib/techniques/union/test.py
 ac67ebbabd06bf9853befc65ad49679e  lib/techniques/union/use.py
 e4146464cf968d4015a52cb8c10e3da5  lib/utils/api.py
 37dfb641358669f62c2acedff241348b  lib/utils/brute.py