diff --git a/classes/db/DBCubrid.class.php b/classes/db/DBCubrid.class.php
index 326973672..fb788d0c7 100644
--- a/classes/db/DBCubrid.class.php
+++ b/classes/db/DBCubrid.class.php
@@ -381,7 +381,7 @@
             foreach($output->conditions as $key => $val) {
                 $sub_condition = '';
                 foreach($val['condition'] as $k =>$v) {
-                    if(!isset($v['value'])) continue;
+                    if(!isset($v['value']) || $v['value'] == '') continue;
 
                     $name = $v['column'];
                     $operation = $v['operation'];
diff --git a/classes/db/DBFirebird.class.php b/classes/db/DBFirebird.class.php
index c73c35525..e1ff12667 100644
--- a/classes/db/DBFirebird.class.php
+++ b/classes/db/DBFirebird.class.php
@@ -592,7 +592,7 @@
             foreach($output->conditions as $key => $val) {
                 $sub_condition = '';
                 foreach($val['condition'] as $k =>$v) {
-                    if(!isset($v['value'])) continue;
+                    if(!isset($v['value']) || $v['value'] == '') continue;
 
                     $name = $v['column'];
                     $operation = $v['operation'];
diff --git a/classes/db/DBMysql.class.php b/classes/db/DBMysql.class.php
index 5941d371e..a0ed6259f 100644
--- a/classes/db/DBMysql.class.php
+++ b/classes/db/DBMysql.class.php
@@ -369,7 +369,7 @@
             foreach($output->conditions as $key => $val) {
                 $sub_condition = '';
                 foreach($val['condition'] as $k =>$v) {
-                    if(!isset($v['value'])) continue;
+                    if(!isset($v['value']) || $v['value'] == '') continue;
 
                     $name = $v['column'];
                     $operation = $v['operation'];
diff --git a/classes/db/DBMysql_innodb.class.php b/classes/db/DBMysql_innodb.class.php
index 08f99a047..6b6317d8c 100644
--- a/classes/db/DBMysql_innodb.class.php
+++ b/classes/db/DBMysql_innodb.class.php
@@ -379,7 +379,7 @@
             foreach($output->conditions as $key => $val) {
                 $sub_condition = '';
                 foreach($val['condition'] as $k =>$v) {
-                    if(!isset($v['value'])) continue;
+                    if(!isset($v['value']) || $v['value'] == '') continue;
 
                     $name = $v['column'];
                     $operation = $v['operation'];
diff --git a/classes/db/DBPostgresql.class.php b/classes/db/DBPostgresql.class.php
index c964b5791..953148782 100644
--- a/classes/db/DBPostgresql.class.php
+++ b/classes/db/DBPostgresql.class.php
@@ -371,7 +371,7 @@
             foreach($output->conditions as $key => $val) {
                 $sub_condition = '';
                 foreach($val['condition'] as $k =>$v) {
-                    if(!isset($v['value'])) continue;
+                    if(!isset($v['value']) || $v['value'] == '') continue;
 
                     $name = $v['column'];
                     $operation = $v['operation'];
diff --git a/classes/db/DBSqlite2.class.php b/classes/db/DBSqlite2.class.php
index df7f517b7..9fbbb4db9 100644
--- a/classes/db/DBSqlite2.class.php
+++ b/classes/db/DBSqlite2.class.php
@@ -352,7 +352,7 @@
             foreach($output->conditions as $key => $val) {
                 $sub_condition = '';
                 foreach($val['condition'] as $k =>$v) {
-                    if(!isset($v['value'])) continue;
+                    if(!isset($v['value']) || $v['value'] == '') continue;
 
                     $name = $v['column'];
                     $operation = $v['operation'];
diff --git a/classes/db/DBSqlite3_pdo.class.php b/classes/db/DBSqlite3_pdo.class.php
index f8cd32b44..43be660c3 100644
--- a/classes/db/DBSqlite3_pdo.class.php
+++ b/classes/db/DBSqlite3_pdo.class.php
@@ -381,7 +381,7 @@
             foreach($output->conditions as $key => $val) {
                 $sub_condition = '';
                 foreach($val['condition'] as $k =>$v) {
-                    if(!isset($v['value'])) continue;
+                    if(!isset($v['value']) || $v['value'] == '') continue;
 
                     $name = $v['column'];
                     $operation = $v['operation'];