diff --git a/lib/core/common.py b/lib/core/common.py
index a18daef06..63d5f36cd 100644
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -770,7 +770,7 @@ def getManualDirectories():
             checkFile(listPath)
             directories = getFileItems(listPath)
         elif choice == '4':
-            targets = {conf.hostname}
+            targets = set([conf.hostname])
             _ = conf.hostname.split('.')
 
             if _[0] == "www":
diff --git a/lib/core/settings.py b/lib/core/settings.py
index e7c146c20..6600deb9c 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 = "1.2.1.22"
+VERSION = "1.2.1.23"
 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/takeover/web.py b/lib/takeover/web.py
index 88df01687..2952a127f 100644
--- a/lib/takeover/web.py
+++ b/lib/takeover/web.py
@@ -205,7 +205,7 @@ class Web:
 
             if readInput(message, default='Y', boolean=True):
                 headers = {}
-                been = {conf.url}
+                been = set([conf.url])
 
                 for match in re.finditer(r"=['\"]((https?):)?(//[^/'\"]+)?(/[\w/.-]*)\bwp-", kb.originalPage or "", re.I):
                     url = "%s%s" % (conf.url.replace(conf.path, match.group(4)), "wp-content/wp-db.php")
diff --git a/lib/utils/crawler.py b/lib/utils/crawler.py
index 10ba77a4b..6c8448594 100644
--- a/lib/utils/crawler.py
+++ b/lib/utils/crawler.py
@@ -126,7 +126,7 @@ def crawl(target):
                     dataToStdout("\r[%s] [INFO] %s" % (time.strftime("%X"), status), True)
 
         threadData.shared.deeper = set()
-        threadData.shared.unprocessed = {target}
+        threadData.shared.unprocessed = set([target])
 
         if not conf.sitemapUrl:
             message = "do you want to check for the existence of "
diff --git a/lib/utils/har.py b/lib/utils/har.py
index 19fc7b678..4def9b3db 100644
--- a/lib/utils/har.py
+++ b/lib/utils/har.py
@@ -180,7 +180,7 @@ class Response:
             "size": len(self.content or "")
         }
 
-        binary = {'\0', '\1'}
+        binary = set(['\0', '\1'])
         if any(c in binary for c in self.content):
             content["encoding"] = "base64"
             content["text"] = base64.b64encode(self.content)
diff --git a/plugins/generic/enumeration.py b/plugins/generic/enumeration.py
index 3983b6b30..0b6190ae4 100644
--- a/plugins/generic/enumeration.py
+++ b/plugins/generic/enumeration.py
@@ -60,13 +60,13 @@ class Enumeration(Custom, Databases, Entries, Search, Users):
             bannerParser(kb.data.banner)
 
             if conf.os and conf.os == "windows":
-                kb.bannerFp["type"] = {"Windows"}
+                kb.bannerFp["type"] = set(["Windows"])
 
             elif conf.os and conf.os == "linux":
-                kb.bannerFp["type"] = {"Linux"}
+                kb.bannerFp["type"] = set(["Linux"])
 
             elif conf.os:
-                kb.bannerFp["type"] = {"%s%s" % (conf.os[0].upper(), conf.os[1:])}
+                kb.bannerFp["type"] = set(["%s%s" % (conf.os[0].upper(), conf.os[1:])])
 
             if conf.os:
                 setOs()
diff --git a/sqlmap.py b/sqlmap.py
index a0dcdb832..0c1e160f8 100755
--- a/sqlmap.py
+++ b/sqlmap.py
@@ -381,3 +381,6 @@ def main():
 
 if __name__ == "__main__":
     main()
+else:
+    # cancelling postponed imports (because of Travis CI checks)
+    from lib.controller.controller import start
\ No newline at end of file
diff --git a/txt/checksum.md5 b/txt/checksum.md5
index 1eb37c21c..c114b5544 100644
--- a/txt/checksum.md5
+++ b/txt/checksum.md5
@@ -27,7 +27,7 @@ a7b0c8e5a18a3abe8803999dcfc4664f  lib/controller/handler.py
 1e5532ede194ac9c083891c2f02bca93  lib/controller/__init__.py
 e3a3f5218b2e52dd0afafdfc9fed2002  lib/core/agent.py
 86a4703d5474badd8462146510b2c460  lib/core/bigarray.py
-e4fa4177b9d3c24555fb275335496e29  lib/core/common.py
+27d1b0a4609eece643141408d1f18716  lib/core/common.py
 2a40d5b5997265daa890545d4a4a59b9  lib/core/convert.py
 9f87391b6a3395f7f50830b391264f27  lib/core/data.py
 72016ea5c994a711a262fd64572a0fcd  lib/core/datatype.py
@@ -46,7 +46,7 @@ ffa5f01f39b17c8d73423acca6cfe86a  lib/core/readlineng.py
 0c3eef46bdbf87e29a3f95f90240d192  lib/core/replication.py
 a7db43859b61569b601b97f187dd31c5  lib/core/revision.py
 fcb74fcc9577523524659ec49e2e964b  lib/core/session.py
-7fc35bef60750c8ba2475c154d7d481c  lib/core/settings.py
+ee202f91d95b559f4cd9355f55203946  lib/core/settings.py
 d0adc28a38e43a787df4471f7f027413  lib/core/shell.py
 63491be462c515a1a3880c27c2acc4a2  lib/core/subprocessng.py
 505aaa61e1bba3c3d4567c3e667699e3  lib/core/target.py
@@ -85,7 +85,7 @@ acc1db3667bf910b809eb279b60595eb  lib/takeover/icmpsh.py
 703e15714316a8cc4bbe54cdd0a8cb87  lib/takeover/metasploit.py
 0fc9b00596df21c8878ef92f513ecad7  lib/takeover/registry.py
 48575dde7bb867b7937769f569a98309  lib/takeover/udf.py
-3972e3e00115c6e4e03336e23e35b1de  lib/takeover/web.py
+1398cb4ee55becf628367854b5310f33  lib/takeover/web.py
 d8c10f278e5943b137a222f4cedca59d  lib/takeover/xp_cmdshell.py
 f6844893afa7569052529e1c8d89bc35  lib/techniques/blind/inference.py
 1e5532ede194ac9c083891c2f02bca93  lib/techniques/blind/__init__.py
@@ -100,10 +100,10 @@ c497003ecf231d03a311a816a6b3b753  lib/techniques/union/test.py
 6c3c4c7d43ad75e61a73184323a81eac  lib/techniques/union/use.py
 e4146464cf968d4015a52cb8c10e3da5  lib/utils/api.py
 37dfb641358669f62c2acedff241348b  lib/utils/brute.py
-8f2f246d17f5891a2e584533bd18e65c  lib/utils/crawler.py
+a34c4fd2e7d78c5dfdd9eeccb079fb1c  lib/utils/crawler.py
 985c737cd8a6a722160c55cf5ee224f4  lib/utils/deps.py
 a6d6888e14a7c11f0884c8cc18489caa  lib/utils/getch.py
-2384f77330583b53018a7dab5fc1c90f  lib/utils/har.py
+7af29f61302c8693cd6436d4b69e22d3  lib/utils/har.py
 9bd8fbfb9c25ee685c97b260331e7165  lib/utils/hashdb.py
 29dee8f54cfb39feb0545d237542f866  lib/utils/hash.py
 145120b21fcfca843d5e2c8b0562e4db  lib/utils/htmlentities.py
@@ -205,7 +205,7 @@ a3db8618eed5bb2807b6f77605cba9cc  plugins/dbms/sybase/__init__.py
 e6cd1c5a5244d83396b401f7db43d323  plugins/generic/custom.py
 315a3ced9667065b24de040af296037a  plugins/generic/databases.py
 b1bd764e8f417222ebb1890232290679  plugins/generic/entries.py
-00e0b1b5713784c8131660bfc40bbaac  plugins/generic/enumeration.py
+d82f2c78c1d4d7c6487e94fd3a68a908  plugins/generic/enumeration.py
 ea0f3b9085061b272bfd98c13ad2d977  plugins/generic/filesystem.py
 f5d5419efddfe04648ea5e953c650793  plugins/generic/fingerprint.py
 1e5532ede194ac9c083891c2f02bca93  plugins/generic/__init__.py
@@ -224,7 +224,7 @@ c3cc8b7727161e64ab59f312c33b541a  shell/stagers/stager.aspx_
 1f7f125f30e0e800beb21e2ebbab18e1  shell/stagers/stager.jsp_
 01e3505e796edf19aad6a996101c81c9  shell/stagers/stager.php_
 4eaeef94314956e4517e5310a28d579a  sqlmapapi.py
-1bef42b51e59db28d04181955c405931  sqlmap.py
+3e2e790c370442c3d98eaa88a3523b15  sqlmap.py
 4c3b8a7daa4bff52e01d4168be0eedbe  tamper/apostrophemask.py
 4115a55b8aba464723d645b7d3156b6e  tamper/apostrophenullencode.py
 4b1024cecb00f13a4e1be78391e9cedb  tamper/appendnullbyte.py