diff --git a/lib/core/common.py b/lib/core/common.py
index e1ebb262a..a1cd539ec 100644
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -3638,13 +3638,31 @@ def randomizeParameterValue(value):
     value = re.sub(r"%[0-9a-fA-F]{2}", "", value)
 
     for match in re.finditer('[A-Z]+', value):
-        retVal = retVal.replace(match.group(), randomStr(len(match.group())).upper())
+        while True:
+            original = match.group()
+            candidate = randomStr(len(match.group())).upper()
+            if original != candidate:
+                break
+
+        retVal = retVal.replace(original, candidate)
 
     for match in re.finditer('[a-z]+', value):
-        retVal = retVal.replace(match.group(), randomStr(len(match.group())).lower())
+        while True:
+            original = match.group()
+            candidate = randomStr(len(match.group())).lower()
+            if original != candidate:
+                break
+
+        retVal = retVal.replace(original, candidate)
 
     for match in re.finditer('[0-9]+', value):
-        retVal = retVal.replace(match.group(), str(randomInt(len(match.group()))))
+        while True:
+            original = match.group()
+            candidate = str(randomInt(len(match.group())))
+            if original != candidate:
+                break
+
+        retVal = retVal.replace(original, candidate)
 
     return retVal
 
diff --git a/lib/core/settings.py b/lib/core/settings.py
index b0efa520b..319b5c09f 100755
--- 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 = "1.1.2.19"
+VERSION = "1.1.2.20"
 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/txt/checksum.md5 b/txt/checksum.md5
index 5670e9eda..91fbe857e 100644
--- a/txt/checksum.md5
+++ b/txt/checksum.md5
@@ -26,7 +26,7 @@ dc386321e8813788f155dc557a78be8d  lib/controller/controller.py
 310efc965c862cfbd7b0da5150a5ad36  lib/controller/__init__.py
 19905ecb4437b94512cf21d5f1720091  lib/core/agent.py
 6cc95a117fbd34ef31b9aa25520f0e31  lib/core/bigarray.py
-664f91efb9a489c2607ff07cce2923bc  lib/core/common.py
+7a8ce69bba0dc1fda2cd3bba3cbad092  lib/core/common.py
 5065a4242a8cccf72f91e22e1007ae63  lib/core/convert.py
 a8143dab9d3a27490f7d49b6b29ea530  lib/core/data.py
 7936d78b1a7f1f008ff92bf2f88574ba  lib/core/datatype.py
@@ -45,7 +45,7 @@ a8143dab9d3a27490f7d49b6b29ea530  lib/core/data.py
 d8e9250f3775119df07e9070eddccd16  lib/core/replication.py
 785f86e3f963fa3798f84286a4e83ff2  lib/core/revision.py
 40c80b28b3a5819b737a5a17d4565ae9  lib/core/session.py
-9587df401ae249ce8e0236d40276aaf6  lib/core/settings.py
+9a2f86dad727c06f86ce0fb26cc65385  lib/core/settings.py
 d91291997d2bd2f6028aaf371bf1d3b6  lib/core/shell.py
 2ad85c130cc5f2b3701ea85c2f6bbf20  lib/core/subprocessng.py
 afd0636d2e93c23f4f0a5c9b6023ea17  lib/core/target.py