diff --git a/js/helper-functions.js b/js/helper-functions.js
index cac4032..cbbfe5d 100644
--- a/js/helper-functions.js
+++ b/js/helper-functions.js
@@ -108,10 +108,10 @@ String.prototype.setFormat = function(styleEnumValue) {
 	var type = StyleEnum.toString(styleEnumValue);
 	var style = defaultStyles[type] ?
 		defaultStyles[type] : defaultStyles.standard;
-	var color = style.color ? style.color : defaultStyles.standard.color;
+	var color = style.color && isValidColor(style.color) ? style.color : defaultStyles.standard.color;
 	var bold = style.bold ? style.bold : defaultStyles.standard.bold;
 	var italic = style.italic ? style.italic : defaultStyles.standard.italic;
-	var backgroundColor = style.backgroundColor ?
+	var backgroundColor = style.backgroundColor && isValidColor(style.backgroundColor) ?
 		style.backgroundColor : defaultStyles.standard.backgroundColor;
 
 	if (bold) {
@@ -122,7 +122,7 @@ String.prototype.setFormat = function(styleEnumValue) {
 		result += "i";
 	}
 
-	if (color && isValidColor(color)) {
+	if (color) {
 		result += CONSTANTS.SEMI_COLON;
 		result += color;
 	} else {
@@ -130,17 +130,11 @@ String.prototype.setFormat = function(styleEnumValue) {
 		color = null;
 	}
 
-	if (backgroundColor && isValidColor(backgroundColor)) {
+	if (backgroundColor) {
 		if (bold || italic || color) {
 			result += CONSTANTS.SEMI_COLON;
 		}
 		result += backgroundColor;
-	} else {
-		result += bold ? CONSTANTS.EMPTY : CONSTANTS.SEMI_COLON;
-		result += italic ? CONSTANTS.EMPTY : CONSTANTS.SEMI_COLON;
-		result += color ? CONSTANTS.EMPTY : CONSTANTS.SEMI_COLON;
-
-		result += defaultStyles.standard.backgroundColor;
 	}
 
 	return wrappedFormatting(result, this);
diff --git a/spec/helping-functions-spec.js b/spec/helping-functions-spec.js
index cd254c1..7e06a32 100644
--- a/spec/helping-functions-spec.js
+++ b/spec/helping-functions-spec.js
@@ -200,6 +200,10 @@ describe("Set format", function() {
 	beforeEach(function() {
 		this.exampleText = "Hello World";
 	});
+	
+	afterEach(function() {
+		defaultStyles['name']['color'] = "green";
+	});
 
 	it("Title format", function() {
 		expect(this.exampleText.setFormat(StyleEnum.TITLE)).toBe("[[b;red;#000]Hello World]");
@@ -232,6 +236,18 @@ describe("Set format", function() {
 	it("Accepts empty style and text", function() {
 		expect("".setFormat("")).toBe("");
 	});
+	
+	it('Accepts invalid styles', function() {
+		defaultStyles['title']['color'] = "cat";
+		expect(this.exampleText.setFormat(StyleEnum.TITLE)).toBe("[[b;white;#000]Hello World]");
+		expect(this.exampleText.setTitle()).toBe("[[b;white;#000]Hello World]");
+	});
+	
+	it('Accepts empty default styles', function() {
+		defaultStyles['name']['color'] = null;
+		expect(this.exampleText.setFormat(StyleEnum.NAME)).toBe("[[b;white;#000]Hello World]");
+		expect(this.exampleText.setName()).toBe("[[b;white;#000]Hello World]");
+	});
 });
 
 describe("Date formatting", function() {