diff --git a/src/b100/json/element/JsonObject.java b/src/b100/json/element/JsonObject.java
index ca6053c..a2df808 100644
--- a/src/b100/json/element/JsonObject.java
+++ b/src/b100/json/element/JsonObject.java
@@ -65,12 +65,29 @@ public void write(StringWriter writer) {
 		
 		int i=0;
 		for(JsonEntry entry : entries) {
-			if(!isCompact()) writer.write('\n');
-			else writer.write(' ');
+			if(!isCompact()) {
+				writer.write('\n');
+			} else {
+				writer.write(' ');
+			}
+			
 			new JsonString(entry.name).write(writer);
+			
 			writer.write(": ");
-			entry.value.write(writer);
-			if(i < entries.size() - 1) writer.write(',');
+			
+			if(entry.value == null) {
+				throw new NullPointerException("Value of entry '" + entry.name + "' is null!");
+			}
+			
+			try {
+				entry.value.write(writer);
+			}catch (Exception e) {
+				throw new RuntimeException("Writing entry '" + entry.name + "'", e);
+			}
+			
+			if(i < entries.size() - 1) {
+				writer.write(',');
+			}
 			i++;
 		}
 		
@@ -235,6 +252,9 @@ public boolean getBoolean(String id, boolean defaultValue) {
 	// Setters
 	
 	public JsonObject set(String id, JsonElement element) {
+		if(element == null) {
+			throw new NullPointerException();
+		}
 		getOrCreateEntry(id).value = element;
 		return this;
 	}
diff --git a/src/b100/json/element/JsonString.java b/src/b100/json/element/JsonString.java
index ab9d9cc..44896e4 100644
--- a/src/b100/json/element/JsonString.java
+++ b/src/b100/json/element/JsonString.java
@@ -4,7 +4,7 @@
 import b100.utils.StringReader;
 import b100.utils.StringWriter;
 
-public class JsonString implements JsonElement{
+public class JsonString implements JsonElement {
 	
 	public String value;
 	
@@ -25,10 +25,31 @@ public JsonString(StringReader reader) {
 				reader.next();
 				char next = reader.get();
 				if(next == 'n' || next == 'N') {
+					// New line
 					builder.append('\n');
-				} else if(next == '\\'){
+					
+				} else if(next == 'u' || next == 'U') {
+					// Unicode hex
+					reader.next();
+					
+					String hex = reader.get(4);
+					int charIndex;
+					
+					try {
+						charIndex = Integer.parseInt(hex, 16);	
+					}catch (NumberFormatException e) {
+						throw new InvalidCharacterException(reader, "Invalid hex code \"" + hex + "\"");
+					}
+					
+					builder.append((char) charIndex);
+					reader.skip(4);
+					
+					continue;
+				} else if(next == '\\') {
+					// Backslash
 					builder.append('\\');
-				}else {
+					
+				} else {
 					throw new InvalidCharacterException(reader);
 				}
 				reader.next();
diff --git a/src/b100/utils/InvalidCharacterException.java b/src/b100/utils/InvalidCharacterException.java
index d12e366..3da2e9c 100644
--- a/src/b100/utils/InvalidCharacterException.java
+++ b/src/b100/utils/InvalidCharacterException.java
@@ -9,11 +9,18 @@ public class InvalidCharacterException extends RuntimeException{
 
 	private StringReader reader;
 	
+	private String message;
+	
 	private int line = 1;
 	private int column = 1;
 	
 	public InvalidCharacterException(StringReader stringReader) {
+		this(stringReader, null);
+	}
+	
+	public InvalidCharacterException(StringReader stringReader, String message) {
 		this.reader = stringReader;
+		this.message = message;
 		
 		String string = reader.string();
 		for(int i=0; i < reader.position(); i++) {
@@ -60,7 +67,11 @@ public String getLinePreview() {
 	}
 	
 	public String getMessage() {
-		return "Invalid character \""+getPrintChar(reader.get(), false)+"\" at line "+line+" column "+column+" (index "+reader.position()+")";
+		if(message != null) {
+			return message + " at line " + line + " column " + column + " (index " + reader.position() + ")";
+		}else {
+			return "Invalid character \"" + getPrintChar(reader.get(), false) + "\" at line " + line + " column " + column + " (index " + reader.position() + ")";	
+		}
 	}
 	
 	public static String getPrintChar(char c, boolean a) {
diff --git a/src/b100/utils/StringReader.java b/src/b100/utils/StringReader.java
index 74da544..0e2d3b1 100644
--- a/src/b100/utils/StringReader.java
+++ b/src/b100/utils/StringReader.java
@@ -18,6 +18,10 @@ public char get() {
 		return string.charAt(i);
 	}
 	
+	public String get(int count) {
+		return string.substring(i, i + count);
+	}
+	
 	public void skipWhitespace() {
 		while(i < string.length() && isWhitespace(get())) i++;
 	}
@@ -28,6 +32,12 @@ public char getAndSkip() {
 		return c;
 	}
 	
+	public String getAndSkip(int count) {
+		String str = get(count);
+		i += count;
+		return str;
+	}
+	
 	public void expectAndSkip(char c) {
 		expect(c);
 		next();