diff --git a/lib/core/common.py b/lib/core/common.py
index e0762ac0e..c361a7375 100644
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -1228,7 +1228,7 @@ def parseTargetDirect():
                     if not hasattr(pymssql, "__version__") or pymssql.__version__ < "1.0.2":
                         errMsg = "'%s' third-party library must be " % data[1]
                         errMsg += "version >= 1.0.2 to work properly. "
-                        errMsg += "Download from %s" % data[2]
+                        errMsg += "Download from '%s'" % data[2]
                         raise sqlmapMissingDependence, errMsg
 
                 elif dbmsName == DBMS.MYSQL:
@@ -1246,7 +1246,7 @@ def parseTargetDirect():
             except ImportError, _:
                 errMsg = "sqlmap requires '%s' third-party library " % data[1]
                 errMsg += "in order to directly connect to the database "
-                errMsg += "%s. Download from %s" % (dbmsName, data[2])
+                errMsg += "%s. Download from '%s'" % (dbmsName, data[2])
                 raise sqlmapMissingDependence, errMsg
 
 def parseTargetUrl():
diff --git a/plugins/generic/enumeration.py b/plugins/generic/enumeration.py
index 63661477c..29e484ee9 100644
--- a/plugins/generic/enumeration.py
+++ b/plugins/generic/enumeration.py
@@ -163,10 +163,7 @@ class Enumeration:
             query = queries[Backend.getIdentifiedDbms()].is_dba.query
 
         query = agent.forgeCaseStatement(query)
-        isDba = inject.getValue(query, charsetType=1)
-
-        if user is None:
-            kb.data.isDba = unArrayizeValue(isDba)
+        isDba = unArrayizeValue(inject.getValue(query, charsetType=1))
 
         return isDba == "1"
 
diff --git a/plugins/generic/misc.py b/plugins/generic/misc.py
index 22bfc9a96..657ee8b81 100644
--- a/plugins/generic/misc.py
+++ b/plugins/generic/misc.py
@@ -83,7 +83,7 @@ class Miscellaneous:
             query = "SELECT %s" % query
 
         kb.bannerFp["dbmsVersion"] = inject.getValue(query)
-        kb.bannerFp["dbmsVersion"] = kb.bannerFp["dbmsVersion"].replace(",", "").replace("-", "").replace(" ", "")
+        kb.bannerFp["dbmsVersion"] = (kb.bannerFp["dbmsVersion"] or "").replace(",", "").replace("-", "").replace(" ", "")
 
     def delRemoteFile(self, tempFile):
         self.checkDbmsOs()