diff --git a/lib/connection/result/column.js b/lib/connection/result/column.js
index e0d1717ef..b8eddbbec 100644
--- a/lib/connection/result/column.js
+++ b/lib/connection/result/column.js
@@ -14,6 +14,7 @@ const dateTimeFormatConverter = require('./datetime_format_converter');
 const bigInt = require('big-integer');
 const moment = require('moment');
 const momentTimezone = require('moment-timezone');
+const util = require('../../util');
 
 /**
  * Creates a new Column.
@@ -296,7 +297,8 @@ function convertRawBoolean(rawColumnValue) {
 /**
  * Converts a raw column value of structured type object to javascript Object
  *
- * @param {String} rawColumnValue
+ * @param {Object} json
+ * @param {Object} context
  *
  * @returns {Object}
  */
@@ -317,6 +319,14 @@ function convertJsonObject(json, context) {
   }
 }
 
+/**
+ * Converts a raw column value of structured type array to javascript Object
+ *
+ * @param {Object} json
+ * @param {Object} context
+ *
+ * @returns {Object}
+ */
 function convertJsonArray(json, context) {
   let result = [];
   if (context.fieldsMetadata) {
@@ -329,7 +339,14 @@ function convertJsonArray(json, context) {
   return result;
 }
 
-
+/**
+ * Converts a raw column value of structured type map to javascript Object
+ *
+ * @param {Object} json
+ * @param {Object} context
+ *
+ * @returns {Object}
+ */
 function convertJsonMap(json, context) {
   const result = new Map;
   if (Array.isArray(context.fieldsMetadata) && context.fieldsMetadata.length === 2) {
@@ -346,37 +363,69 @@ function convertJsonMap(json, context) {
 }
 
 /**
- * Converts a raw column value of structured type object to javascript Object
+ * Converts a raw column value of structured type OBJECT to javascript Object
  *
- * @param {String} parsedJsonValue
+ * @param {String} rawColumnValue
+ * @param {Object} column
+ * @param {Object} context
  *
  * @returns {Object}
  */
 function convertRawObject(rawColumnValue, column, context) {
-  const json = JSON.parse(rawColumnValue);
-  return convertJsonObject(json, context);
+  if (Util.string.isNotNullOrEmpty(rawColumnValue)) {
+    try {
+      const json = JSON.parse(rawColumnValue);
+      return convertJsonObject(json, context);
+    } catch (jsonParseError) {
+      Logger.getInstance().debug('Column %s raw value cannot be parsed as JSON: %s ', column.name, jsonParseError.message);
+      throw new Error(util.format('Column [%s] raw value cannot be parsed as JSON: %s ', column.name, jsonParseError.message));
+    }
+  } else {
+    throw new Error(util.format('Column %s raw value is null or empty ', column.name));
+  }
 }
 /**
- * Converts a raw column value of structured type array to javascript Array
+ * Converts a raw column value of structured type ARRAY to javascript Array
  *
- * @param {String} parsedJsonValue
+ * @param {String} rawColumnValue
+ * @param {Object} column
+ * @param {Object} context
  *
  * @returns {Object}
  */
 function convertRawArray(rawColumnValue, column, context) {
-  const json = JSON.parse(rawColumnValue);
-  return convertJsonArray(json, context);
+  if (Util.string.isNotNullOrEmpty(rawColumnValue)) {
+    try {
+      const json = JSON.parse(rawColumnValue);
+      return convertJsonArray(json, context);
+    } catch (jsonParseError) {
+      Logger.getInstance().debug('Column %s raw value cannot be parsed as JSON: %s ', column.name, jsonParseError.message);
+      throw new Error(util.format('Column [%s] raw value cannot be parsed as JSON: %s ', column.name, jsonParseError.message));
+    }
+  } else {
+    throw new Error(util.format('Column %s raw value is null or empty ', column.name));
+  }
 }
 /**
  * Converts a raw column value of structured type MAP to javascript Map
- *
- * @param {String} parsedJsonValue
+ * @param {String} rawColumnValue
+ * @param {Object} column
+ * @param {Object} context
  *
  * @returns {Object}
  */
 function convertRawMap(rawColumnValue, column, context) {
-  const json = JSON.parse(rawColumnValue);
-  return convertJsonMap(json, context);
+  if (Util.string.isNotNullOrEmpty(rawColumnValue)) {
+    try {
+      const json = JSON.parse(rawColumnValue);
+      return convertJsonMap(json, context);
+    } catch (jsonParseError) {
+      Logger.getInstance().debug('Column %s raw value cannot be parsed as JSON: %s ', column.name, jsonParseError.message);
+      throw new Error(util.format('Column [%s] raw value cannot be parsed as JSON: %s ', column.name, jsonParseError.message));
+    }
+  } else {
+    throw new Error(util.format('Column %s raw value is null or empty ', column.name));
+  }
 }
 
 function mapStructuredTypeValue(columnValue, context, metadataField) {
diff --git a/lib/connection/result/datetime_format_converter.js b/lib/connection/result/datetime_format_converter.js
index 971ebc888..880714c31 100644
--- a/lib/connection/result/datetime_format_converter.js
+++ b/lib/connection/result/datetime_format_converter.js
@@ -60,15 +60,7 @@ function convertSnowflakeFormatToMomentFormat(formatSql, scale) {
     } else {
       // we found one of our special tags
       if (out === '') {
-        if (tag === 'TZH') {
-          // format the moment to get the timezone string and extract the
-          // hours; for example, '-0700' will be converted to '-07'
-          out = moment.format('ZZ').substr(0, 3);
-        } else if (tag === 'TZM') {
-          // format the moment to get the timezone string and extract the
-          // minutes; for example, '-0700' will be converted to '00
-          out = moment.format('ZZ').substr(3);
-        } else if (tag === 'FF') {
+        if (tag === 'FF') {
           // if 'FF' is followed by a digit, use the digit as the scale
           let digit = null;
           if (pos + tag.length < length) {
diff --git a/test/integration/testStructuredType.js b/test/integration/testStructuredType.js
index 5e9a420b2..e26b8d28c 100644
--- a/test/integration/testStructuredType.js
+++ b/test/integration/testStructuredType.js
@@ -26,7 +26,7 @@ function normalize(source) {
 }
 
 
-describe.only('Test Structured types', function () {
+describe('Test Structured types', function () {
   let connection;
 
   before(function (done) {