diff --git a/lib/core/common.py b/lib/core/common.py
index 8c55e4289..ac54d9f4b 100644
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -67,6 +67,7 @@ from lib.core.settings import INFERENCE_UNKNOWN_CHAR
 from lib.core.settings import UNICODE_ENCODING
 from lib.core.settings import DBMS_DICT
 from lib.core.settings import DESCRIPTION
+from lib.core.settings import DUMMY_SQL_INJECTION_CHARS
 from lib.core.settings import IS_WIN
 from lib.core.settings import PLATFORM
 from lib.core.settings import PYVERSION
@@ -498,6 +499,13 @@ def paramToDict(place, parameters=None):
                 condition |= parameter in conf.testParameter
 
                 if condition:
+                    if elem[1].strip(DUMMY_SQL_INJECTION_CHARS) != elem[1]:
+                        errMsg = "you have provided parameters with most "
+                        errMsg += "probably leftovers from manual sql injection "
+                        errMsg += "tests (%s). " % DUMMY_SQL_INJECTION_CHARS
+                        errMsg += "please, remove them so sqlmap could be able "
+                        errMsg += "to do a valid run."
+                        raise sqlmapSyntaxException, errMsg
                     testableParameters[parameter] = elem[1]
     else:
         root = ET.XML(parameters)
diff --git a/lib/core/settings.py b/lib/core/settings.py
index ecd985952..06c75d783 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -351,3 +351,6 @@ REFLECTIVE_MISS_THRESHOLD = 20
 
 # Regular expression used for extracting HTML title
 HTML_TITLE_REGEX = "<title>(?P<result>[^<]+)</title>"
+
+# Chars used to quickly distinguish if the user provided tainted parameter values
+DUMMY_SQL_INJECTION_CHARS = ";()'"