diff --git a/plugins/dbms/access/syntax.py b/plugins/dbms/access/syntax.py
index 494eff917..36a4f6184 100644
--- a/plugins/dbms/access/syntax.py
+++ b/plugins/dbms/access/syntax.py
@@ -27,7 +27,7 @@ class Syntax(GenericSyntax):
                 index = expression[firstIndex:].find("'")
 
                 if index == -1:
-                    raise sqlmapSyntaxException, "Unenclosed ' in '%s'" % expression
+                    break
 
                 lastIndex = firstIndex + index
                 old = "'%s'" % expression[firstIndex:lastIndex]
diff --git a/plugins/dbms/firebird/syntax.py b/plugins/dbms/firebird/syntax.py
index a601470e0..3928f3d75 100644
--- a/plugins/dbms/firebird/syntax.py
+++ b/plugins/dbms/firebird/syntax.py
@@ -29,7 +29,7 @@ class Syntax(GenericSyntax):
                     index = expression[firstIndex:].find("'")
 
                     if index == -1:
-                        raise sqlmapSyntaxException, "Unenclosed ' in '%s'" % expression
+                        break
 
                     lastIndex = firstIndex + index
                     old = "'%s'" % expression[firstIndex:lastIndex]
diff --git a/plugins/dbms/mssqlserver/syntax.py b/plugins/dbms/mssqlserver/syntax.py
index ca3559612..c3442096d 100644
--- a/plugins/dbms/mssqlserver/syntax.py
+++ b/plugins/dbms/mssqlserver/syntax.py
@@ -27,7 +27,7 @@ class Syntax(GenericSyntax):
                 index = expression[firstIndex:].find("'")
 
                 if index == -1:
-                    raise sqlmapSyntaxException("Unenclosed ' in '%s'" % expression)
+                    break
 
                 lastIndex = firstIndex + index
                 old = "'%s'" % expression[firstIndex:lastIndex]
diff --git a/plugins/dbms/mysql/syntax.py b/plugins/dbms/mysql/syntax.py
index 4fa3bc98e..871e5c7d7 100644
--- a/plugins/dbms/mysql/syntax.py
+++ b/plugins/dbms/mysql/syntax.py
@@ -27,7 +27,7 @@ class Syntax(GenericSyntax):
                 index = expression[firstIndex:].find("'")
 
                 if index == -1:
-                    raise sqlmapSyntaxException, "Unenclosed ' in '%s'" % expression
+                    break
 
                 lastIndex = firstIndex + index
                 old = "'%s'" % expression[firstIndex:lastIndex]
diff --git a/plugins/dbms/oracle/syntax.py b/plugins/dbms/oracle/syntax.py
index 141beeefd..ac915ddd2 100644
--- a/plugins/dbms/oracle/syntax.py
+++ b/plugins/dbms/oracle/syntax.py
@@ -26,7 +26,7 @@ class Syntax(GenericSyntax):
                 index = expression[firstIndex:].find("'")
 
                 if index == -1:
-                    raise sqlmapSyntaxException, "Unenclosed ' in '%s'" % expression
+                    break
 
                 lastIndex = firstIndex + index
                 old = "'%s'" % expression[firstIndex:lastIndex]
diff --git a/plugins/dbms/postgresql/syntax.py b/plugins/dbms/postgresql/syntax.py
index 833ffe6ec..3c432f470 100644
--- a/plugins/dbms/postgresql/syntax.py
+++ b/plugins/dbms/postgresql/syntax.py
@@ -27,7 +27,7 @@ class Syntax(GenericSyntax):
                 index = expression[firstIndex:].find("'")
 
                 if index == -1:
-                    raise sqlmapSyntaxException, "Unenclosed ' in '%s'" % expression
+                    break
 
                 lastIndex = firstIndex + index
                 old = "'%s'" % expression[firstIndex:lastIndex]
diff --git a/plugins/dbms/sqlite/syntax.py b/plugins/dbms/sqlite/syntax.py
index a7030565f..9d8c01ac8 100644
--- a/plugins/dbms/sqlite/syntax.py
+++ b/plugins/dbms/sqlite/syntax.py
@@ -30,7 +30,7 @@ class Syntax(GenericSyntax):
                     index = expression[firstIndex:].find("''")
 
                     if index == -1:
-                        raise sqlmapSyntaxException, "Unenclosed ' in '%s'" % expression.replace("''", "'")
+                        break
 
                     lastIndex = firstIndex + index
                     old = "''%s''" % expression[firstIndex:lastIndex]
diff --git a/plugins/dbms/sybase/syntax.py b/plugins/dbms/sybase/syntax.py
index ca3559612..c3442096d 100644
--- a/plugins/dbms/sybase/syntax.py
+++ b/plugins/dbms/sybase/syntax.py
@@ -27,7 +27,7 @@ class Syntax(GenericSyntax):
                 index = expression[firstIndex:].find("'")
 
                 if index == -1:
-                    raise sqlmapSyntaxException("Unenclosed ' in '%s'" % expression)
+                    break
 
                 lastIndex = firstIndex + index
                 old = "'%s'" % expression[firstIndex:lastIndex]