diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9c12bac3..7e7c407b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 
 ### Added
 - Added `testLocally` function (analog `test` fn)
+- Added `ConfigurationException`
 
 ### Changed
 - Server config `setPty` renamed to `pty` [#953](https://github.com/deployphp/deployer/pull/953)
@@ -12,6 +13,7 @@
 - `deploy:unlock` now always successful [#950](https://github.com/deployphp/deployer/pull/950)
 - Added option `-L` to `setfacl` [#956](https://github.com/deployphp/deployer/pull/956)
 - Run `deploy:unlock` when deploy is fail [#958](https://github.com/deployphp/deployer/pull/958)
+- Now throw exception on duplicates in `shared_dirs`
 
 ### Fixed
 - Fixed native ssh scp option
diff --git a/recipe/deploy/shared.php b/recipe/deploy/shared.php
index 0bec4bc8..c194dd13 100644
--- a/recipe/deploy/shared.php
+++ b/recipe/deploy/shared.php
@@ -7,10 +7,21 @@
 
 namespace Deployer;
 
+use Deployer\Exception\ConfigurationException;
+
 desc('Creating symlinks for shared files and dirs');
 task('deploy:shared', function () {
     $sharedPath = "{{deploy_path}}/shared";
 
+    // Validate shared_dir, find duplicates
+    foreach (get('shared_dirs') as $a) {
+        foreach (get('shared_dirs') as $b) {
+            if ($a !== $b && strpos($a, $b) === 0) {
+                throw new ConfigurationException("Can not share same dirs `$a` and `$b`.");
+            }
+        }
+    }
+
     foreach (get('shared_dirs') as $dir) {
         // Check if shared dir does not exists.
         if (!test("[ -d $sharedPath/$dir ]")) {
diff --git a/src/Exception/ConfigurationException.php b/src/Exception/ConfigurationException.php
new file mode 100644
index 00000000..82c865fe
--- /dev/null
+++ b/src/Exception/ConfigurationException.php
@@ -0,0 +1,12 @@
+<?php
+/* (c) Anton Medvedev <anton@medv.io>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Deployer\Exception;
+
+class ConfigurationException extends \RuntimeException
+{
+}