diff --git a/lib/core/settings.py b/lib/core/settings.py
index 1338d675d..ace8cdacb 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 = "1.2.8.12"
+VERSION = "1.2.8.13"
 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)
diff --git a/lib/request/pkihandler.py b/lib/request/pkihandler.py
index 369cf7d4d..71a5eb352 100644
--- a/lib/request/pkihandler.py
+++ b/lib/request/pkihandler.py
@@ -9,6 +9,8 @@ import httplib
 import urllib2
 
 from lib.core.data import conf
+from lib.core.common import getSafeExString
+from lib.core.exception import SqlmapConnectionException
 
 class HTTPSPKIAuthHandler(urllib2.HTTPSHandler):
     def __init__(self, auth_file):
@@ -19,5 +21,10 @@ class HTTPSPKIAuthHandler(urllib2.HTTPSHandler):
         return self.do_open(self.getConnection, req)
 
     def getConnection(self, host, timeout=None):
-        # Reference: https://docs.python.org/2/library/ssl.html#ssl.SSLContext.load_cert_chain
-        return httplib.HTTPSConnection(host, cert_file=self.auth_file, key_file=self.auth_file, timeout=conf.timeout)
+        try:
+            # Reference: https://docs.python.org/2/library/ssl.html#ssl.SSLContext.load_cert_chain
+            return httplib.HTTPSConnection(host, cert_file=self.auth_file, key_file=self.auth_file, timeout=conf.timeout)
+        except IOError, ex:
+            errMsg = "error occurred while using key "
+            errMsg += "file '%s' ('%s')" % (self.auth_file, getSafeExString(ex))
+            raise SqlmapConnectionException(errMsg)
diff --git a/txt/checksum.md5 b/txt/checksum.md5
index 27c47cf97..18b703e9a 100644
--- a/txt/checksum.md5
+++ b/txt/checksum.md5
@@ -48,7 +48,7 @@ c8c386d644d57c659d74542f5f57f632  lib/core/patch.py
 0c3eef46bdbf87e29a3f95f90240d192  lib/core/replication.py
 a7db43859b61569b601b97f187dd31c5  lib/core/revision.py
 fcb74fcc9577523524659ec49e2e964b  lib/core/session.py
-aaeca967ebd83967b78a9a56fb029696  lib/core/settings.py
+0cb27d1543a4cd5a1f466846965a2bf3  lib/core/settings.py
 dd68a9d02fccb4fa1428b20e15b0db5d  lib/core/shell.py
 a7edc9250d13af36ac0108f259859c19  lib/core/subprocessng.py
 5b7ff6f49ff3af62f8c12f74b6d49dd2  lib/core/target.py
@@ -77,7 +77,7 @@ dd4598675027fae99f2e2475b05986da  lib/request/direct.py
 1e5532ede194ac9c083891c2f02bca93  lib/request/__init__.py
 a5cbc19ee18bd4b848515eb3ea3291f0  lib/request/inject.py
 aaf956c1e9855836c3f372e29d481393  lib/request/methodrequest.py
-51eeaa8abf5ba62aaaade66d46ff8b00  lib/request/pkihandler.py
+83c7a13e38ad5eedb6bb13463a7a9e90  lib/request/pkihandler.py
 2c3774b72586985719035b195f144d7b  lib/request/rangehandler.py
 3cd9d17fc52bb62db29e0e24fc4d8a97  lib/request/redirecthandler.py
 7f12d8f3b6665ed7053954bba70ff718  lib/request/templates.py