diff --git a/lib/core/bigarray.py b/lib/core/bigarray.py
index da01be481..a5711105a 100644
--- a/lib/core/bigarray.py
+++ b/lib/core/bigarray.py
@@ -22,7 +22,10 @@ from lib.core.exception import SqlmapSystemException
 from lib.core.settings import BIGARRAY_CHUNK_SIZE
 from lib.core.settings import BIGARRAY_COMPRESS_LEVEL
 
-DEFAULT_SIZE_OF = sys.getsizeof(object())
+try:
+    DEFAULT_SIZE_OF = sys.getsizeof(object())
+except TypeError:
+    DEFAULT_SIZE_OF = 16
 
 def _size_of(instance):
     """
diff --git a/lib/core/common.py b/lib/core/common.py
index bd9c6bdef..ae95a90cc 100644
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -2270,6 +2270,7 @@ def isMultiThreadMode():
     """
     Checks if running in multi-thread(ing) mode
 
+    >>> import time
     >>> isMultiThreadMode()
     False
     >>> _ = lambda: time.sleep(0.1)
diff --git a/lib/core/settings.py b/lib/core/settings.py
index d41bbf999..3f4632671 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -19,7 +19,7 @@ from lib.core.enums import OS
 from thirdparty.six import unichr as _unichr
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.5.5.7"
+VERSION = "1.5.5.8"
 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/utils/hash.py b/lib/utils/hash.py
index a7a5614bf..38b853063 100644
--- a/lib/utils/hash.py
+++ b/lib/utils/hash.py
@@ -351,7 +351,7 @@ def crypt_generic_passwd(password, salt, **kwargs):
     'rl.3StKT.4T8M'
     """
 
-    return crypt(password, salt)
+    return getText(crypt(password, salt))
 
 def unix_md5_passwd(password, salt, magic="$1$", **kwargs):
     """