diff --git a/index.js b/index.js
index 796d258..04dbb4d 100644
--- a/index.js
+++ b/index.js
@@ -306,24 +306,24 @@ define("internals/inputProcessor", ["require", "exports", "internals/maskTokeniz
     }
     function canNextCharBeSkipped(currentChar, inputType, currentToken) {
         return (inputType === UserInputType.INSERTION &&
-            currentToken.literal &&
-            currentToken.optional &&
-            !currentCharMatchesRegex(currentChar, currentToken));
+            currentToken && currentToken.literal &&
+            (currentToken.optional ||
+                !currentCharMatchesRegex(currentChar, currentToken)));
     }
     function canNextCharBeAutoCompleted(currentChar, inputType, currentToken) {
         return (inputType === UserInputType.INSERTION &&
-            currentToken.literal &&
+            currentToken && currentToken.literal &&
             !currentToken.optional &&
             !currentCharMatchesRegex(currentChar, currentToken));
     }
     function canCurrentCharBeRemovedFromInput(currentChar, inputType, currentToken) {
         return (inputType === UserInputType.INSERTION &&
-            !currentToken.literal &&
+            currentToken && !currentToken.literal &&
             !currentCharMatchesRegex(currentChar, currentToken));
     }
     function currentCharMatchesRegex(currentChar, token) {
-        const match = currentChar.match(token.regex);
-        return (match != null && match[0] === currentChar);
+        const match = token && currentChar.match(token.regex);
+        return match != null && (match[0] === currentChar || (!match[0] && token.optional));
     }
 });
 define("index", ["require", "exports", "react", "react", "react-native", "internals/inputProcessor"], function (require, exports, React, react_1, react_native_1, inputProcessor_1) {
diff --git a/internals/inputProcessor.ts b/internals/inputProcessor.ts
index edbce58..496177f 100644
--- a/internals/inputProcessor.ts
+++ b/internals/inputProcessor.ts
@@ -144,16 +144,16 @@ function autofillNextChars(currentChar: string, inputType: UserInputType, tokens
 function canNextCharBeSkipped(currentChar: string, inputType: UserInputType, currentToken: ITokenRegex): boolean {
 	return (
 		inputType === UserInputType.INSERTION &&
-		currentToken.literal &&
-		currentToken.optional &&
-		!currentCharMatchesRegex(currentChar, currentToken)
+		currentToken && currentToken.literal &&
+		(currentToken.optional ||
+			!currentCharMatchesRegex(currentChar, currentToken))
 	);
 }
 
 function canNextCharBeAutoCompleted(currentChar: string, inputType: UserInputType, currentToken: ITokenRegex): boolean {
 	return (
 		inputType === UserInputType.INSERTION &&
-		currentToken.literal &&
+		currentToken && currentToken.literal &&
 		!currentToken.optional &&
 		!currentCharMatchesRegex(currentChar, currentToken)
 	);
@@ -162,12 +162,12 @@ function canNextCharBeAutoCompleted(currentChar: string, inputType: UserInputTyp
 function canCurrentCharBeRemovedFromInput(currentChar: string, inputType: UserInputType, currentToken: ITokenRegex): boolean {
 	return (
 		inputType === UserInputType.INSERTION &&
-		!currentToken.literal &&
+		currentToken && !currentToken.literal &&
 		!currentCharMatchesRegex(currentChar, currentToken)
 	);
 }
 
 function currentCharMatchesRegex(currentChar: string, token: ITokenRegex): boolean {
-	const match = currentChar.match(token.regex);
-	return (match != null && match[0] === currentChar);
+	const match = token && currentChar.match(token.regex);
+	return match != null && (match[0] === currentChar || (!match[0] && token.optional));
 }
diff --git a/internals/inputProcessorTest.ts b/internals/inputProcessorTest.ts
index e3bbf66..d9dfe38 100644
--- a/internals/inputProcessorTest.ts
+++ b/internals/inputProcessorTest.ts
@@ -156,6 +156,38 @@ test('When providing complete value to the mask containing optional tokens in th
 	]);
 });
 
+test('IP format', () => {
+	const inputProcessor = createInputProcessor('00?0?.00?0?.00?0?.00?0?');
+	const inputValues = ['127.0.0.100'];
+	const outputResults = enterValuesOneAtTime(inputValues, inputProcessor);
+
+	expect(outputResults).toEqual([
+		{
+			text: '127.0.0.100',
+			complete: true
+		}
+	]);
+});
+
+/* TODO
+test('Korean car number format', () => {
+	const inputProcessor = createInputProcessor('s?s? 00?0? s 0000');
+	const inputValues = ['AB 01 X 1234', '01 X 1234'];
+	const outputResults = enterValuesOneAtTime(inputValues, inputProcessor);
+
+	expect(outputResults).toEqual([
+		{
+			text: 'AB 01 X 1234',
+			complete: true
+		},
+		{
+			text: '01 X 1234',
+			complete: true
+		},
+	]);
+});
+*/
+
 function maskedResultToText(results: IMaskedTextResult[]): string[] {
 	return results.map((result) => result.text);
 }
@@ -174,4 +206,4 @@ function pressKeysOneAtTime(keys: string[], inputProcessor: InputProcessorFuncti
 
 function enterValuesOneAtTime(values: string[], inputProcessor: InputProcessorFunction): IMaskedTextResult[] {
 	return values.map((value) => inputProcessor(value, UserInputType.INSERTION));
-}
\ No newline at end of file
+}