diff --git a/lib/core/settings.py b/lib/core/settings.py
index dd0db9a26..13523470f 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 = "1.1.5.15"
+VERSION = "1.1.5.16"
 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/plugins/generic/users.py b/plugins/generic/users.py
index 4ef609b6f..b09169dff 100644
--- a/plugins/generic/users.py
+++ b/plugins/generic/users.py
@@ -424,7 +424,8 @@ class Users:
 
                             # In Firebird we get one letter for each privilege
                             elif Backend.isDbms(DBMS.FIREBIRD):
-                                privileges.add(FIREBIRD_PRIVS[privilege.strip()])
+                                if privilege.strip() in FIREBIRD_PRIVS:
+                                    privileges.add(FIREBIRD_PRIVS[privilege.strip()])
 
                             # In DB2 we get Y or G if the privilege is
                             # True, N otherwise
diff --git a/txt/checksum.md5 b/txt/checksum.md5
index da3902835..e4c95562d 100644
--- a/txt/checksum.md5
+++ b/txt/checksum.md5
@@ -46,7 +46,7 @@ d85f2f63ffcb6135400339f9a7595a7b  lib/core/option.py
 d8e9250f3775119df07e9070eddccd16  lib/core/replication.py
 785f86e3f963fa3798f84286a4e83ff2  lib/core/revision.py
 40c80b28b3a5819b737a5a17d4565ae9  lib/core/session.py
-61702ed8a1974c3fa575efde25a21c97  lib/core/settings.py
+8c82b503090da324c876065bc1b7338c  lib/core/settings.py
 d91291997d2bd2f6028aaf371bf1d3b6  lib/core/shell.py
 2ad85c130cc5f2b3701ea85c2f6bbf20  lib/core/subprocessng.py
 8136241fdbdb99a5dc0e51ba72918f6e  lib/core/target.py
@@ -212,7 +212,7 @@ be7481a96214220bcd8f51ca00239bed  plugins/generic/connector.py
 070f58c52e2a04e7a9896b42b2d17dc2  plugins/generic/search.py
 562cfa80a15d5f7f1d52e10c5736d7e2  plugins/generic/syntax.py
 fca9946e960942cc9b22ef26e12b8b3a  plugins/generic/takeover.py
-156ea264f3f1c7fc18faa251cc1f1a4b  plugins/generic/users.py
+bc0b47ced3db9f6746966d8dfc423b56  plugins/generic/users.py
 310efc965c862cfbd7b0da5150a5ad36  plugins/__init__.py
 b04db3e861edde1f9dd0a3850d5b96c8  shell/backdoor.asp_
 158bfa168128393dde8d6ed11fe9a1b8  shell/backdoor.aspx_