diff --git a/packages/bbob-parser/src/Token.js b/packages/bbob-parser/src/Token.js
index 8ae9ddf..6c5159c 100644
--- a/packages/bbob-parser/src/Token.js
+++ b/packages/bbob-parser/src/Token.js
@@ -17,19 +17,70 @@ const TOKEN_TYPE_ATTR_VALUE = 'attr-value';
 const TOKEN_TYPE_SPACE = 'space';
 const TOKEN_TYPE_NEW_LINE = 'new-line';
 
-const getTokenValue = (token) => token[TOKEN_VALUE_ID];
-const getTokenLine = (token) => token[TOKEN_LINE_ID];
-const getTokenColumn = (token) => token[TOKEN_COLUMN_ID];
+/**
+ * @param {Token} token
+ * @returns {string}
+ */
+const getTokenValue = (token) => {
+  if (token && typeof token[TOKEN_VALUE_ID] !== 'undefined') {
+    return token[TOKEN_VALUE_ID];
+  }
 
-const isTextToken = (token) => token[TOKEN_TYPE_ID] === TOKEN_TYPE_SPACE
-    || token[TOKEN_TYPE_ID] === TOKEN_TYPE_NEW_LINE
-    || token[TOKEN_TYPE_ID] === TOKEN_TYPE_WORD;
+  return '';
+};
+/**
+ * @param {Token}token
+ * @returns {number}
+ */
+const getTokenLine = (token) => (token && token[TOKEN_LINE_ID]) || 0;
+const getTokenColumn = (token) => (token && token[TOKEN_COLUMN_ID]) || 0;
 
-const isTagToken = (token) => token[TOKEN_TYPE_ID] === TOKEN_TYPE_TAG;
+/**
+ * @param {Token} token
+ * @returns {boolean}
+ */
+const isTextToken = (token) => {
+  if (token && typeof token[TOKEN_TYPE_ID] !== 'undefined') {
+    return token[TOKEN_TYPE_ID] === TOKEN_TYPE_SPACE
+        || token[TOKEN_TYPE_ID] === TOKEN_TYPE_NEW_LINE
+        || token[TOKEN_TYPE_ID] === TOKEN_TYPE_WORD;
+  }
+
+  return false;
+};
+
+/**
+ * @param {Token} token
+ * @returns {boolean}
+ */
+const isTagToken = (token) => {
+  if (token && typeof token[TOKEN_TYPE_ID] !== 'undefined') {
+    return token[TOKEN_TYPE_ID] === TOKEN_TYPE_TAG;
+  }
+
+  return false;
+};
 const isTagEnd = (token) => getTokenValue(token).charCodeAt(0) === SLASH.charCodeAt(0);
 const isTagStart = (token) => !isTagEnd(token);
-const isAttrNameToken = (token) => token[TOKEN_TYPE_ID] === TOKEN_TYPE_ATTR_NAME;
-const isAttrValueToken = (token) => token[TOKEN_TYPE_ID] === TOKEN_TYPE_ATTR_VALUE;
+const isAttrNameToken = (token) => {
+  if (token && typeof token[TOKEN_TYPE_ID] !== 'undefined') {
+    return token[TOKEN_TYPE_ID] === TOKEN_TYPE_ATTR_NAME;
+  }
+
+  return false;
+};
+
+/**
+ * @param {Token} token
+ * @returns {boolean}
+ */
+const isAttrValueToken = (token) => {
+  if (token && typeof token[TOKEN_TYPE_ID] !== 'undefined') {
+    return token[TOKEN_TYPE_ID] === TOKEN_TYPE_ATTR_VALUE;
+  }
+
+  return false;
+};
 
 const getTagName = (token) => {
   const value = getTokenValue(token);
diff --git a/packages/bbob-parser/src/parse.js b/packages/bbob-parser/src/parse.js
index 93d9283..2bb697f 100644
--- a/packages/bbob-parser/src/parse.js
+++ b/packages/bbob-parser/src/parse.js
@@ -77,7 +77,11 @@ const parse = (input, opts = {}) => {
   const getNodes = () => {
     const lastNestedNode = nestedNodes.getLast();
 
-    return lastNestedNode ? lastNestedNode.content : nodes.toArray();
+    if (lastNestedNode && Array.isArray(lastNestedNode.content)) {
+      return lastNestedNode.content;
+    }
+
+    return nodes.toArray();
   };
 
   /**
@@ -85,7 +89,11 @@ const parse = (input, opts = {}) => {
    * @param {TagNode} tag
    */
   const appendNodes = (tag) => {
-    getNodes().push(tag);
+    const items = getNodes();
+
+    if (Array.isArray(items)) {
+      items.push(tag);
+    }
   };
 
   /**
diff --git a/packages/bbob-parser/src/utils.js b/packages/bbob-parser/src/utils.js
index 7d00d0b..b6d11df 100644
--- a/packages/bbob-parser/src/utils.js
+++ b/packages/bbob-parser/src/utils.js
@@ -57,8 +57,22 @@ export const createCharGrabber = (source, options) => {
 
       return source.substr(start, cursor.pos - start);
     },
-    getNext: () => source[cursor.pos + 1],
-    getPrev: () => source[cursor.pos - 1],
+    getNext: () => {
+      const nextPos = cursor.pos + 1;
+
+      if (nextPos <= (source.length - 1)) {
+        return source[nextPos];
+      }
+      return null;
+    },
+    getPrev: () => {
+      const prevPos = cursor.pos - 1;
+
+      if (typeof source[prevPos] !== 'undefined') {
+        return source[prevPos];
+      }
+      return null;
+    },
     getCurr,
     getRest,
     /**
@@ -127,7 +141,13 @@ export const createList = (values = []) => {
   /**
    * @callback getLastCb
    */
-  const getLast = () => (nodes.length ? nodes[nodes.length - 1] : null);
+  const getLast = () => {
+    if (Array.isArray(nodes) && nodes.length > 0 && typeof nodes[nodes.length - 1] !== 'undefined') {
+      return nodes[nodes.length - 1];
+    }
+
+    return null;
+  };
   /**
    * @callback flushLastCb
    * @return {*}