diff --git a/lib/core/settings.py b/lib/core/settings.py
index df9131212..8d5e96c96 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -20,7 +20,7 @@ from thirdparty import six
 from thirdparty.six import unichr as _unichr
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.5.9.7"
+VERSION = "1.5.9.8"
 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/blind/inference.py b/lib/techniques/blind/inference.py
index 9104ae625..eba260aa7 100644
--- a/lib/techniques/blind/inference.py
+++ b/lib/techniques/blind/inference.py
@@ -366,7 +366,7 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
                             if threadData.lastCode is not None:
                                 warnMsg = "unexpected HTTP code '%s' detected." % threadData.lastCode
                             else:
-                                warnMsg = "unexpected response detected." % threadData.lastCode
+                                warnMsg = "unexpected response detected."
 
                             warnMsg += " Will use (extra) validation step in similar cases"