diff --git a/classes/Model.php b/classes/Model.php
index 23b3fda..62bbee0 100644
--- a/classes/Model.php
+++ b/classes/Model.php
@@ -621,7 +621,7 @@ class Model extends Object
 
 			foreach ($this->conditions as $column => $value)
 			{
-				if (is_string($column) || is_string($value))
+				if (!is_int($column))
 				{
 					$use_id = false;
 				}
diff --git a/jar.php b/jar.php
index 5c07085..cf44da9 100755
--- a/jar.php
+++ b/jar.php
@@ -4686,7 +4686,7 @@ class Model extends Object
 
 			foreach ($this->conditions as $column => $value)
 			{
-				if (is_string($column) || is_string($value))
+				if (!is_int($column))
 				{
 					$use_id = false;
 				}