diff --git a/.gitignore b/.gitignore
index 413c0ae..ef7d308 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ node_modules
 package-lock.json
 sessions.json
 client_sessions.json
+center_sessions.json
diff --git a/main.js b/main.js
index 15d5a83..b412c14 100644
--- a/main.js
+++ b/main.js
@@ -345,11 +345,6 @@ class ClientSessionManager {
 
 	constructor() {
 		this.sessions = {};
-		process.on('exit', this.cleanup.bind(this));
-		process.on('SIGINT', this.cleanup.bind(this));
-		process.on('SIGUSR1', this.cleanup.bind(this));
-		process.on('SIGUSR2', this.cleanup.bind(this));
-		process.on('uncaughtException', this.cleanup.bind(this));
 	}
 
 	createSession(url, username, password) {
@@ -392,7 +387,6 @@ class ClientSessionManager {
 	cleanup() {
 		this.logger.log1(`Saving sessions to ${CLIENT_SESSIONS_FILE}...`);
 		fs.writeFileSync(CLIENT_SESSIONS_FILE, JSON.stringify(this.serialize(), null, 4));
-		process.exit(0);
 	}
 
 	startup() {
@@ -620,11 +614,6 @@ class CenterSessionManager {
 
 	constructor() {
 		this.servers = {};
-		process.on('exit', this.cleanup.bind(this));
-		process.on('SIGINT', this.cleanup.bind(this));
-		process.on('SIGUSR1', this.cleanup.bind(this));
-		process.on('SIGUSR2', this.cleanup.bind(this));
-		process.on('uncaughtException', this.cleanup.bind(this));
 	}
 
 	createSession(port, username, password) {
@@ -666,7 +655,6 @@ class CenterSessionManager {
 	cleanup() {
 		this.logger.log1(`Saving sessions to ${CENTER_SESSIONS_FILE}...`);
 		fs.writeFileSync(CENTER_SESSIONS_FILE, JSON.stringify(this.serialize(), null, 4));
-		process.exit(0);
 	}
 
 	startup() {
@@ -1089,4 +1077,16 @@ let session = clientSessionManager.createSession('smpp://localhost:7001', 'test'
 session.connect().then(() => session.bind());
 
 new WSServer();
-new HTTPServer();
\ No newline at end of file
+new HTTPServer();
+
+function cleanup() {
+	clientSessionManager.cleanup();
+	centerSessionManager.cleanup();
+	process.exit(0);
+}
+
+process.on('exit', cleanup);
+process.on('SIGINT', cleanup);
+process.on('SIGUSR1', cleanup);
+process.on('SIGUSR2', cleanup);
+process.on('uncaughtException', cleanup);
\ No newline at end of file