diff --git a/syncplay/client.py b/syncplay/client.py
index 23c21e8..1063882 100644
--- a/syncplay/client.py
+++ b/syncplay/client.py
@@ -1405,6 +1405,9 @@ class SyncplayPlaylist():
             return
 
         try:
+            if index is None:
+                self._ui.showDebugMessage(u"Cannot switch to None index in playlist")
+                return
             filename = self._playlist[index]
             # TODO: Handle isse with index being None
             if utils.isURL(filename):
@@ -1597,14 +1600,18 @@ class FileSwitchManager(object):
         self.currentDirectory = curDir
 
     def changeMediaDirectories(self, mediaDirs):
-        if mediaDirs <> self._client._config["mediaSearchDirectories"]:
-            from syncplay.ui.ConfigurationGetter import ConfigurationGetter
-            ConfigurationGetter().setConfigOption("mediaSearchDirectories", mediaDirs)
-            self._client._config["mediaSearchDirectories"] = mediaDirs
-            self._client.ui.showMessage(getMessage("media-directory-list-updated-notification"))
+        from syncplay.ui.ConfigurationGetter import ConfigurationGetter
+        ConfigurationGetter().setConfigOption("mediaSearchDirectories", mediaDirs)
+        self._client._config["mediaSearchDirectories"] = mediaDirs
+        self._client.ui.showMessage(getMessage("media-directory-list-updated-notification"))
         self.mediaDirectoriesNotFound = []
         self.folderSearchEnabled = True
         self.setMediaDirectories(mediaDirs)
+        if mediaDirs == "":
+            self._client.ui.showErrorMessage(getMessage("no-media-directories-error"))
+            self.mediaFilesCache = {}
+            self.newInfo = True
+            self.checkForFileSwitchUpdate()
 
     def setMediaDirectories(self, mediaDirs):
         self.mediaDirectories = mediaDirs
diff --git a/syncplay/messages_de.py b/syncplay/messages_de.py
index 89a824f..658ef63 100644
--- a/syncplay/messages_de.py
+++ b/syncplay/messages_de.py
@@ -142,6 +142,7 @@ de = {
     "folder-search-timeout-error" : u"The search for media in media directories was aborted as it took too long to search through '{}'. This will occur if you select a folder with too many sub-folders in your list of media folders to search through. For automatic file switching to work again please select File->Set Media Directories in the menu bar and remove this directory or replace it with an appropriate sub-folder.", #Folder # TODO: Translate
     "folder-search-first-file-timeout-error" : u"The search for media in '{}' was aborted as it took too long to access the directory. This could happen if it is a network drive or if you configure your drive to spin down after a period of inactivity. For automatic file switching to work again please go to File->Set Media Directories and either remove the directory or resolve the issue (e.g. by changing power saving settings).", #Folder # TODO: Translate
     "added-file-not-in-media-directory-error" : u"You loaded a file in '{}' which is not a known media directory. You can add this as a media directory by selecting File->Set Media Directories in the menu bar.", #Folder # TODO: Translate
+    "no-media-directories-error" : u"No media directories have been set. For shared playlist and file switching features to work properly please select File->Set Media Directories and specify where Syncplay should look to find media files.", # TODO: Translate
 
     "failed-to-load-server-list-error" : u"Konnte die Liste der öffentlichen Server nicht laden. Bitte besuche http://www.syncplay.pl/ [Englisch] mit deinem Browser.",
 
diff --git a/syncplay/messages_en.py b/syncplay/messages_en.py
index ba99bec..08347ac 100644
--- a/syncplay/messages_en.py
+++ b/syncplay/messages_en.py
@@ -142,6 +142,7 @@ en = {
     "folder-search-timeout-error" : u"The search for media in media directories was aborted as it took too long to search through '{}'. This will occur if you select a folder with too many sub-folders in your list of media folders to search through. For automatic file switching to work again please select File->Set Media Directories in the menu bar and remove this directory or replace it with an appropriate sub-folder.", #Folder
     "folder-search-first-file-timeout-error" : u"The search for media in '{}' was aborted as it took too long to access the directory. This could happen if it is a network drive or if you configure your drive to spin down after a period of inactivity. For automatic file switching to work again please go to File->Set Media Directories and either remove the directory or resolve the issue (e.g. by changing power saving settings).", #Folder
     "added-file-not-in-media-directory-error" : u"You loaded a file in '{}' which is not a known media directory. You can add this as a media directory by selecting File->Set Media Directories in the menu bar.", #Folder
+    "no-media-directories-error" : u"No media directories have been set. For shared playlist and file switching features to work properly please select File->Set Media Directories and specify where Syncplay should look to find media files.",
 
     "failed-to-load-server-list-error" : u"Failed to load public server list. Please visit http://www.syncplay.pl/ in your browser.",
 
diff --git a/syncplay/messages_ru.py b/syncplay/messages_ru.py
index 5efbc89..45db12c 100644
--- a/syncplay/messages_ru.py
+++ b/syncplay/messages_ru.py
@@ -142,6 +142,7 @@ ru = {
     "folder-search-timeout-error" : u"The search for media in media directories was aborted as it took too long to search through '{}'. This will occur if you select a folder with too many sub-folders in your list of media folders to search through. For automatic file switching to work again please select File->Set Media Directories in the menu bar and remove this directory or replace it with an appropriate sub-folder.", #Folder # TODO: Translate
     "folder-search-first-file-timeout-error" : u"The search for media in '{}' was aborted as it took too long to access the directory. This could happen if it is a network drive or if you configure your drive to spin down after a period of inactivity. For automatic file switching to work again please go to File->Set Media Directories and either remove the directory or resolve the issue (e.g. by changing power saving settings).", #Folder # TODO: Translate
     "added-file-not-in-media-directory-error" : u"You loaded a file in '{}' which is not a known media directory. You can add this as a media directory by selecting File->Set Media Directories in the menu bar.", #Folder #TODO: Translate
+    "no-media-directories-error" : u"No media directories have been set. For shared playlist and file switching features to work properly please select File->Set Media Directories and specify where Syncplay should look to find media files.", # TODO: Translate
 
     "failed-to-load-server-list-error" : u"Failed to load public server list. Please visit http://www.syncplay.pl/ in your browser.", # TODO: Translate into Russian
 
diff --git a/syncplay/ui/gui.py b/syncplay/ui/gui.py
index 40b5ddc..17283f4 100644
--- a/syncplay/ui/gui.py
+++ b/syncplay/ui/gui.py
@@ -299,6 +299,8 @@ class MainWindow(QtGui.QMainWindow):
             self.playlistGroup.setChecked(self.config['sharedPlaylistEnabled'])
             self.playlistGroup.blockSignals(False)
             self._syncplayClient.fileSwitch.setMediaDirectories(self.config["mediaSearchDirectories"])
+            if not self.config["mediaSearchDirectories"]:
+                self._syncplayClient.ui.showErrorMessage(getMessage("no-media-directories-error"))
             self.updateReadyState(self.config['readyAtStart'])
             autoplayInitialState = self.config['autoplayInitialState']
             if autoplayInitialState is not None: