diff --git a/greenlight.js b/greenlight.js
index b8a5874..d3baa74 100644
--- a/greenlight.js
+++ b/greenlight.js
@@ -43,6 +43,7 @@ if(transpiler.runChecks()) {
 	console.log(colors.green + "[OK] Syntax checker finished, no issues found!" + colors.reset);
 } else {
 	console.log(colors.yellow + "[WARN] Syntax checker found at least one issue in your code!" + colors.reset);
+	return -1;
 }
 
 if(process.argv[2] === "c") {
diff --git a/lib/syntax_checker.js b/lib/syntax_checker.js
index b8fae84..50c1691 100644
--- a/lib/syntax_checker.js
+++ b/lib/syntax_checker.js
@@ -2,18 +2,56 @@ let colors = require(__dirname + "/colors");
 
 function checkSyntax(compiledCode) {
 	let checkPassed = true;
-	let splitCode = compiledCode.split(" ");
-	
-	if(!checkAsyncFunctionCalls(splitCode)) checkPassed = false;
+	let splitCode = compiledCode.split(";");
+
+	if (!checkParenthesesBracket(splitCode)) checkPassed = false;
+
+	splitCode = compiledCode.split(" ");
+	if (!checkAsyncFunctionCalls(splitCode)) checkPassed = false;
 
 	return checkPassed;
 }
 
+function checkParenthesesBracket(code) {
+	let passed = true;
+
+	for (let i = 0; i < code.length; i++) {
+		// Case 1: '(' is not properly closed
+		if (code[i].includes("(")) {
+			let flag = true; // check '(', ')' is a pair
+			code[i].split("").forEach(char => {
+				if (flag && char === "(") flag = false; // needs ')'
+				if (!flag && char === ")") flag = true; // needs '('
+			});
+			// '(', ')' is not a pair
+			if (!flag) {
+				console.log(colors.yellow + "[WARN] '(' is not closed. This could cause syntax errors: " + code[i] + colors.reset);
+				passed = false;
+			}
+		}
+
+		// Case 2: '[' is not properly closed
+		if (code[i].includes("[")) {
+			let flag = true; // check '[', ']' is a pair
+			code[i].split("").forEach(char => {
+				if (flag && char === "[") flag = false; // needs ']'
+				if (!flag && char === "]") flag = true; // needs '['
+			});
+			// '[', ']' is not a pair
+			if (!flag) {
+				console.log(colors.yellow + "[WARN] Array '[' is not closed. This could cause syntax errors: " + code[i] + colors.reset);
+				passed = false;
+			}
+		}
+	}
+	return passed;
+}
+
 function checkAsyncFunctionCalls(code) {
 	let passed = true;
 	let withinString = false;
-	for(let i = 1; i < code.length; i++) {
-		if(code[i].endsWith("(") && code[i-1] !== "await") {
+	for (let i = 1; i < code.length; i++) {
+		if (code[i].endsWith("(") && code[i - 1] !== "await") {
 			console.log(colors.yellows + "[WARN] Function call made without call statement. This could cause serious logic errors: " + code[i] + colors.reset);
 			passed = false;
 		}