diff --git a/lib/ssh-client.js b/lib/ssh-client.js
index 6e52c26..190774f 100644
--- a/lib/ssh-client.js
+++ b/lib/ssh-client.js
@@ -43,6 +43,7 @@ class SSHClient {
       this.client.sftp((error, sftp) => {
         if (error) {
           reject(error);
+          return;
         }
 
         let stream = sftp.createWriteStream(path);
@@ -60,6 +61,7 @@ class SSHClient {
       this.client.sftp((error, sftp) => {
         if (error) {
           reject(error);
+          return;
         }
 
         sftp.readFile(path, { }, function(error, data) {
@@ -78,6 +80,7 @@ class SSHClient {
       this.client.exec(command, (err/*, stream*/) => {
         if (err) {
           reject(err);
+          return;
         }
         resolve();
       });
@@ -95,11 +98,13 @@ class SSHClient {
         this.client.sftp(function (err, sftp) {
           if (err) {
             reject(err);
+            return;
           }
 
           sftp.fastPut(src, dest, {}, function (err) {
             if (err) {
               reject(err);
+              return;
             }
             resolve();
           });