diff --git a/lib/Drivers/DML/mysql.js b/lib/Drivers/DML/mysql.js
index d73b5d08..bc3d8c03 100755
--- a/lib/Drivers/DML/mysql.js
+++ b/lib/Drivers/DML/mysql.js
@@ -267,7 +267,9 @@ Driver.prototype.propertyToValue = function (value, property) {
 			value = (value) ? 1 : 0;
 			break;
 		case "object":
-			value = JSON.stringify(value);
+			if (value !== null) {
+				value = JSON.stringify(value);
+			}
 			break;
 		case "point":
 			return function() { return 'POINT(' + value.x + ', ' + value.y + ')'; };
diff --git a/lib/Drivers/DML/postgres.js b/lib/Drivers/DML/postgres.js
index b2470b69..5dc5ca2b 100644
--- a/lib/Drivers/DML/postgres.js
+++ b/lib/Drivers/DML/postgres.js
@@ -302,7 +302,9 @@ Driver.prototype.propertyToValue = function (value, property) {
 
 	switch (property.type) {
 		case "object":
-			value = JSON.stringify(value);
+			if (value !== null) {
+				value = JSON.stringify(value);
+			}
 			break;
 		case "date":
 			if (this.config.timezone && this.config.timezone != 'local') {
diff --git a/lib/Drivers/DML/sqlite.js b/lib/Drivers/DML/sqlite.js
index 023ffecf..d124bcd7 100644
--- a/lib/Drivers/DML/sqlite.js
+++ b/lib/Drivers/DML/sqlite.js
@@ -273,7 +273,9 @@ Driver.prototype.propertyToValue = function (value, property) {
 			value = (value) ? 1 : 0;
 			break;
 		case "object":
-			value = JSON.stringify(value);
+			if (value !== null) {
+				value = JSON.stringify(value);
+			}
 			break;
 		case "date":
 			if (this.config.query && this.config.query.strdates) {