diff --git a/lib/utils/yamlAstParser.js b/lib/utils/yamlAstParser.js
index 91c30404c..6708c70a4 100644
--- a/lib/utils/yamlAstParser.js
+++ b/lib/utils/yamlAstParser.js
@@ -4,7 +4,6 @@ const fs = require('fs');
 const _ = require('lodash');
 const os = require('os');
 
-const astObject = {};
 const findKeyChain = (astContent) => {
   let content = astContent;
   const chain = [
@@ -19,32 +18,35 @@ const findKeyChain = (astContent) => {
   return chain.reverse().join('.');
 };
 
-const parseAST = (ymlAstContent) => {
+const parseAST = (ymlAstContent, astObject) => {
+  let newAstObject = astObject || {};
   if (ymlAstContent.mappings && _.isArray(ymlAstContent.mappings)) {
     _.forEach(ymlAstContent.mappings, (v) => {
       if (v.key.kind === 0 && v.value.kind === 0) {
-        astObject[findKeyChain(v)] = v.value;
+        newAstObject[findKeyChain(v)] = v.value;
       } else if (v.key.kind === 0 && v.value.kind === 2) {
-        astObject[findKeyChain(v)] = v.value;
-        parseAST(v.value);
+        newAstObject[findKeyChain(v)] = v.value;
+        newAstObject = parseAST(v.value, newAstObject);
       } else if (v.key.kind === 0 && v.value.kind === 3) {
-        astObject[findKeyChain(v)] = v.value;
-        parseAST(v.value);
+        newAstObject[findKeyChain(v)] = v.value;
+        newAstObject = parseAST(v.value, newAstObject);
       }
     });
   } else if (ymlAstContent.items && _.isArray(ymlAstContent.items)) {
     _.forEach(ymlAstContent.items, (v, i) => {
       if (v.kind === 0) {
         const key = `${findKeyChain(ymlAstContent.parent)}[${i}]`;
-        astObject[key] = v;
+        newAstObject[key] = v;
       }
     });
   }
+
+  return newAstObject;
 };
 
 const addNewArrayItem = (ymlFile, pathInYml, newValue) => {
   const yamlContent = fs.readFileSync(ymlFile, 'utf8');
-  parseAST(yaml.load(yamlContent), astObject);
+  const astObject = parseAST(yaml.load(yamlContent));
 
   if (astObject[pathInYml] && astObject[pathInYml].items) {
     let newArray = [];
@@ -76,7 +78,7 @@ const addNewArrayItem = (ymlFile, pathInYml, newValue) => {
 
 const removeExistingArrayItem = (ymlFile, pathInYml, removeValue) => {
   const yamlContent = fs.readFileSync(ymlFile, 'utf8');
-  parseAST(yaml.load(yamlContent), astObject);
+  const astObject = parseAST(yaml.load(yamlContent));
 
   if (astObject[pathInYml] && astObject[pathInYml].items) {
     const newArray = [];