diff --git a/App.js b/App.js
index a76fa42..29121eb 100644
--- a/App.js
+++ b/App.js
@@ -24,7 +24,7 @@ export default class App extends Component<Props> {
     return (
       <View style={styles.container}>
         <StyledText 
-          text="Welcome to <b><u>React Native</u> <demo>Styled Text</demo></b> demo!"
+          text="Welcome to <b><u>React Native</u> <demo><i>Styled</i> Text</demo></b> demo!"
           style={styles.welcome}
           textStyles={textStyles}
         />
@@ -111,7 +111,6 @@ const textStyles = StyleSheet.create({
     textShadowColor: '#555555',
     textShadowRadius: 6,
     fontSize: 18,
-    fontStyle: 'italic',
     color: '#22AA44',
   },
   code: {
diff --git a/README.md b/README.md
index d2bd6a6..ecad81d 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,7 @@ import { StyledText } from 'react-native-styled-text';
 
 ...
   <StyledText
-    text="Happy <b>Styling</b>!"
+    text="Ha<i>pp</i>y <b>Styling</b>!"
     style={styles.header}
   />
 ...
@@ -70,7 +70,7 @@ import { StyledText } from 'react-native-styled-text';
 
 ...
   <StyledText 
-    text="Welcome to <b>React Native <demo>Styled Text</demo></b> demo!"
+    text="Welcome to <b><u>React Native</u> <demo><i>Styled</i> Text</demo></b> demo!"
     style={styles.welcome}
     textStyles={textStyles}
   />
@@ -90,7 +90,6 @@ const textStyles = StyleSheet.create({
     textShadowColor: '#555555',
     textShadowRadius: 6,
     fontSize: 24,
-    fontStyle: 'italic',
     color: '#22AA44',
   },
 });
diff --git a/docs/example-android.png b/docs/example-android.png
index 791a93b..3ab769b 100644
Binary files a/docs/example-android.png and b/docs/example-android.png differ
diff --git a/docs/example-ios.png b/docs/example-ios.png
index e0a667f..e248638 100644
Binary files a/docs/example-ios.png and b/docs/example-ios.png differ
diff --git a/docs/happyStyling.png b/docs/happyStyling.png
index 8e6a380..c0eed5a 100644
Binary files a/docs/happyStyling.png and b/docs/happyStyling.png differ
diff --git a/docs/welcome.png b/docs/welcome.png
index 1f2166c..6d69755 100644
Binary files a/docs/welcome.png and b/docs/welcome.png differ
diff --git a/lib/StyledText/lexicalAnalyzer.js b/lib/StyledText/lexicalAnalyzer.js
index 78478e4..36860f5 100644
--- a/lib/StyledText/lexicalAnalyzer.js
+++ b/lib/StyledText/lexicalAnalyzer.js
@@ -15,6 +15,10 @@ const replaceCodes = (text: string) => {
 }
 
 export const scan = (text: string): Array<Token> => {
+  if (text === undefined || text === null || text === '') {
+    return [{ type: TOKEN_TEXT, lexeme: text }];
+  }
+
   const tagRegex = /<([\w-]+)>|<\/([\w-]*)>/;
   const tokens = [];
 
diff --git a/lib/StyledText/renderer.js b/lib/StyledText/renderer.js
index 75c94e0..733ffcf 100644
--- a/lib/StyledText/renderer.js
+++ b/lib/StyledText/renderer.js
@@ -2,6 +2,7 @@ import * as React from 'react';
 import { Text, StyleSheet } from 'react-native';
 
 import { parse, Mixed } from './parser';
+import { verifyTextStyles } from './utils';
 
 const defaultStyles = {
   b: {
@@ -15,26 +16,8 @@ const defaultStyles = {
   }
 };
 
-const verifyTextStyles = (mixedText: Mixed, textStyles: Object) => {
-  const styleNames = [];
-  mixedText.map(element => {
-    if (typeof element !== 'string') {
-      const index = styleNames.indexOf(element.styleName);
-      if (index < 0) {
-        styleNames.push(element.styleName);
-      }
-    }
-  });
-
-  styleNames.forEach((styleName) => {
-    if (!textStyles[styleName] && !defaultStyles[styleName]) {
-      console.warn('react-native-styled-text: style "' + styleName + '" is not defined');
-    }
-  });
-}
-
 const renderMixedText = (mixedText: Mixed, textStyles: Object) => mixedText.map((element, index) => (
-  typeof element === 'string'
+  typeof element === 'string' || element === undefined || element === null
     ? element
     : React.createElement(
       Text,
@@ -49,7 +32,7 @@ const renderMixedText = (mixedText: Mixed, textStyles: Object) => mixedText.map(
 export const renderStyledText = (text, style, textStyles) => {
   const mixedText = parse(text);
   const styles = textStyles || {}
-  verifyTextStyles(mixedText, styles);
+  verifyTextStyles(mixedText, styles, defaultStyles);
 
   const textElements = renderMixedText(mixedText, styles);
 
diff --git a/lib/StyledText/utils.js b/lib/StyledText/utils.js
new file mode 100644
index 0000000..35a8097
--- /dev/null
+++ b/lib/StyledText/utils.js
@@ -0,0 +1,35 @@
+import { Mixed } from './parser';
+
+const findAllTextStyles = (
+  mixedText: Mixed, 
+  accStyleNames: Array<string> = []
+) : Array<string> => {
+  mixedText.map(element => {
+    if (!(typeof element === 'string' || element === undefined || element === null)) {
+      const index = accStyleNames.indexOf(element.styleName);
+      if (index < 0) {
+        accStyleNames.push(element.styleName);
+      }
+ 
+      accStyleNames = findAllTextStyles(element.mixedText, accStyleNames);
+    }
+  });
+
+  return accStyleNames;
+}
+  
+const verifyTextStyles = (
+  mixedText: Mixed, 
+  textStyles: Object, 
+  defaultStyles: Object
+) => {
+  const styleNames = findAllTextStyles(mixedText);
+   
+  styleNames.forEach((styleName) => {
+    if (!textStyles[styleName] && !defaultStyles[styleName]) {
+  	  console.warn('react-native-styled-text: style "' + styleName + '" is not defined');
+    }
+  });
+}
+  
+export { verifyTextStyles };
\ No newline at end of file
diff --git a/lib/__tests__/lexicalAnalyzer.spec.js b/lib/__tests__/lexicalAnalyzer.spec.js
index 073ca79..c73cd6f 100644
--- a/lib/__tests__/lexicalAnalyzer.spec.js
+++ b/lib/__tests__/lexicalAnalyzer.spec.js
@@ -6,7 +6,7 @@ import {
   TOKEN_TEXT,
 } from '../StyledText/lexicalAnalyzer';
 
-describe('components/FormattedText/lexicalAnalyzer', () => {
+describe('StyledText/lexicalAnalyzer', () => {
   describe('scan', () => {
     it('should return text if plain text', () => {
       const text = 'Testing <asdf adsf';
diff --git a/lib/__tests__/parser.spec.js b/lib/__tests__/parser.spec.js
index 0aa8d4e..fe7d4ce 100644
--- a/lib/__tests__/parser.spec.js
+++ b/lib/__tests__/parser.spec.js
@@ -3,7 +3,7 @@ import { parse } from '../StyledText/parser';
 let warnings = [];
 const warn = msg => warnings.push(msg);
 
-describe('components/FormattedText/parser', () => {
+describe('StyledText/parser', () => {
   beforeAll(() => {
     console['warn'] = warn;
   });
@@ -19,6 +19,27 @@ describe('components/FormattedText/parser', () => {
       expect(mixedText[0]).toBe(text);
     });
 
+    it('should return undefined if undefined', () => {
+      const text = undefined;
+      const mixedText = parse(text);
+      expect(mixedText.length).toBe(1);
+      expect(mixedText[0]).toBe(text);
+    });
+
+    it('should return null if null', () => {
+      const text = undefined;
+      const mixedText = parse(text);
+      expect(mixedText.length).toBe(1);
+      expect(mixedText[0]).toBe(text);
+    });
+
+    it('should return "" if ""', () => {
+      const text = '';
+      const mixedText = parse(text);
+      expect(mixedText.length).toBe(1);
+      expect(mixedText[0]).toBe(text);
+    });
+
     it('should handle text if enclosed in tags', () => {
       const text = '<style1>Testing adsf</>';
       const mixedText = parse(text);
diff --git a/lib/__tests__/utils.spec.js b/lib/__tests__/utils.spec.js
new file mode 100644
index 0000000..be79861
--- /dev/null
+++ b/lib/__tests__/utils.spec.js
@@ -0,0 +1,86 @@
+import { verifyTextStyles } from '../StyledText/utils';
+
+let warnings = [];
+const warn = msg => warnings.push(msg);
+const textStyles = { 
+  style1: {},
+  style2: {},
+};
+const defaultStyles = {
+  b: {},
+  i: {},
+  u: {}
+};
+
+describe('StyledText/utils', () => {
+  beforeAll(() => {
+    console['warn'] = warn;
+  });
+  beforeEach(() => {
+    warnings = [];
+  });
+
+  describe('verifyTextStyles', () => {
+    it('should not give warning on undefined', () => {
+      const mixedText = [undefined];
+      verifyTextStyles(mixedText, textStyles, defaultStyles);
+      expect(warnings.length).toBe(0);
+    });
+
+    it('should not give warning on null', () => {
+      const mixedText = [null];
+      verifyTextStyles(mixedText, textStyles, defaultStyles);
+      expect(warnings.length).toBe(0);
+    });
+
+    it('should not give warning on ""', () => {
+      const mixedText = [''];
+      verifyTextStyles(mixedText, textStyles, defaultStyles);
+      expect(warnings.length).toBe(0);
+    });
+
+    it('should not give warning on "test"', () => {
+      const mixedText = ['test'];
+      verifyTextStyles(mixedText, textStyles, defaultStyles);
+      expect(warnings.length).toBe(0);
+    });
+
+    it('should not give warning on defined styles', () => {
+      const mixedText = [
+        'test', 
+        { 
+          styleName: 'style1', 
+          mixedText: [
+            'test2', 
+            { 
+              styleName: 'b', 
+              mixedText: ['test3']
+            }
+          ]
+        }
+      ];
+      verifyTextStyles(mixedText, textStyles, defaultStyles);
+      expect(warnings.length).toBe(0);
+    });
+
+    it('should not give warning on undefined styles', () => {
+      const mixedText = [
+        'test', 
+        { 
+          styleName: 'style3', 
+          mixedText: [
+            'test2', 
+            { 
+              styleName: 'e', 
+              mixedText: ['test3']
+            }
+          ]
+        }
+      ];
+      verifyTextStyles(mixedText, textStyles, defaultStyles);
+      expect(warnings.length).toBe(2);
+      expect(warnings[0]).toContain('"style3"');
+      expect(warnings[1]).toContain('"e"');
+    });
+  });
+});