diff --git a/lib/db_ido_mysql/idomysqlconnection.cpp b/lib/db_ido_mysql/idomysqlconnection.cpp
index ab2295277..560f8f8a0 100644
--- a/lib/db_ido_mysql/idomysqlconnection.cpp
+++ b/lib/db_ido_mysql/idomysqlconnection.cpp
@@ -673,7 +673,7 @@ void IdoMysqlConnection::InternalExecuteQuery(const DbQuery& query, DbQueryType
 		BOOST_FOREACH(const Dictionary::Pair& kv, query.Fields) {
 			Value value;
 
-			if (kv.second.IsEmpty())
+			if (kv.second.IsEmpty() && !kv.second.IsString())
 				continue;
 
 			if (!FieldToEscapedString(kv.first, kv.second, &value))
diff --git a/lib/db_ido_pgsql/idopgsqlconnection.cpp b/lib/db_ido_pgsql/idopgsqlconnection.cpp
index 5faf4dfd1..e401b75cd 100644
--- a/lib/db_ido_pgsql/idopgsqlconnection.cpp
+++ b/lib/db_ido_pgsql/idopgsqlconnection.cpp
@@ -668,7 +668,7 @@ void IdoPgsqlConnection::InternalExecuteQuery(const DbQuery& query, DbQueryType
 		Value value;
 		bool first = true;
 		BOOST_FOREACH(const Dictionary::Pair& kv, query.Fields) {
-			if (kv.second.IsEmpty())
+			if (kv.second.IsEmpty() && !kv.second.IsString())
 				continue;
 
 			if (!FieldToEscapedString(kv.first, kv.second, &value))