diff --git a/source/assembler/assembler.d b/source/assembler/assembler.d
index 1f0c108..bcecd05 100644
--- a/source/assembler/assembler.d
+++ b/source/assembler/assembler.d
@@ -526,7 +526,8 @@ int AssemblerCLI(string[] args) {
 	auto assembler = new Assembler();
 	auto lexer     = new Lexer();
 
-	lexer.src = readText(inFile);
+	lexer.src  = readText(inFile);
+	lexer.file = inFile;
 	lexer.Lex();
 
 	if (debugLexer) {
@@ -540,6 +541,10 @@ int AssemblerCLI(string[] args) {
 	parser.tokens = lexer.tokens;
 	parser.Parse();
 
+	if (!parser.success) {
+		return 1;
+	}
+
 	if (debugParser) {
 		parser.PrintNodes();
 		return 0;
diff --git a/source/assembler/lexer.d b/source/assembler/lexer.d
index 1fc1057..d30b5e6 100644
--- a/source/assembler/lexer.d
+++ b/source/assembler/lexer.d
@@ -74,14 +74,14 @@ class Lexer {
 	void Lex() {
 		reading   = "";
 		inString  = false;
-		line      = 1;
-		col       = 1;
+		line      = 0;
+		col       = 0;
 		src      ~= '\n';
 
 		for (i = 0; i < src.length; ++ i) {
 			if (src[i] == '\n') {
 				++ line;
-				col = 1;
+				col = 0;
 			}
 			else {
 				++ col;
diff --git a/source/assembler/parser.d b/source/assembler/parser.d
index 16f91f5..df10f57 100644
--- a/source/assembler/parser.d
+++ b/source/assembler/parser.d
@@ -143,10 +143,17 @@ class StringNode : Node {
 	}
 }
 
+class ParserFail : Exception {
+	this(string msg = "", string file = __FILE__, size_t line = __LINE__) {
+		super(msg, file, line);
+	}
+}
+
 class Parser {
 	size_t  i;
 	Node[]  nodes;
 	Token[] tokens;
+	bool    success;
 
 	this() {
 
@@ -164,6 +171,11 @@ class Parser {
 		}
 	}
 
+	void Error(string str) {
+		ErrorBegin(CurrentError());
+		stderr.writeln(str);
+	}
+
 	Node ParseParameter() {
 		switch (tokens[i].type) {
 			case TokenType.Identifier: {
@@ -191,6 +203,10 @@ class Parser {
 					to!int(tokens[i].contents[2 .. $], 2), CurrentError()
 				);
 			}
+			case TokenType.Label: {
+				Error("Cannot use label statement as parameter");
+				throw new ParserFail();
+			}
 			default: assert(0);
 		}
 	}
@@ -236,7 +252,15 @@ class Parser {
 
 	void Parse() {
 		for (i = 0; i < tokens.length; ++ i) {
-			auto node = ParseStatement();
+			Node node;
+
+			try {
+				node = ParseStatement();
+			}
+			catch (ParserFail) {
+				success = false;
+				return;
+			}
 
 			if (node !is null) {
 				nodes ~= node;