diff --git a/airsonic-main/src/main/java/org/airsonic/player/controller/AccessDeniedController.java b/airsonic-main/src/main/java/org/airsonic/player/controller/AccessDeniedController.java
index 51ff8998..d3c70ca5 100644
--- a/airsonic-main/src/main/java/org/airsonic/player/controller/AccessDeniedController.java
+++ b/airsonic-main/src/main/java/org/airsonic/player/controller/AccessDeniedController.java
@@ -21,7 +21,7 @@ public class AccessDeniedController {
 
     @GetMapping
     public ModelAndView accessDenied(HttpServletRequest request, HttpServletResponse response) {
-        LOG.info("The IP {0} tried to access the forbidden url {1}.", request.getRemoteAddr(), request.getRequestURL());
+        LOG.info("The IP {} tried to access the forbidden url {}.", request.getRemoteAddr(), request.getRequestURL());
         return new ModelAndView("accessDenied");
     }
 
diff --git a/airsonic-main/src/main/java/org/airsonic/player/controller/PodcastReceiverAdminController.java b/airsonic-main/src/main/java/org/airsonic/player/controller/PodcastReceiverAdminController.java
index 65354639..f5178e80 100644
--- a/airsonic-main/src/main/java/org/airsonic/player/controller/PodcastReceiverAdminController.java
+++ b/airsonic-main/src/main/java/org/airsonic/player/controller/PodcastReceiverAdminController.java
@@ -56,11 +56,11 @@ public class PodcastReceiverAdminController {
             podcastService.createChannel(url);
             return new ModelAndView(new RedirectView("podcastChannels.view"));
         }
-        if (request.getParameter("downloadEpisode") != null) {
+        if (request.getParameter("downloadEpisode") != null && channelId != null) {
             download(StringUtil.parseInts(request.getParameter("downloadEpisode")));
             return new ModelAndView(new RedirectView("podcastChannel.view?id=" + channelId));
         }
-        if (request.getParameter("deleteChannel") != null) {
+        if (request.getParameter("deleteChannel") != null && channelId != null) {
             podcastService.deleteChannel(channelId);
             return new ModelAndView(new RedirectView("podcastChannels.view"));
         }
diff --git a/airsonic-main/src/main/java/org/airsonic/player/security/CustomUserDetailsContextMapper.java b/airsonic-main/src/main/java/org/airsonic/player/security/CustomUserDetailsContextMapper.java
index 0272144e..6bfa0582 100644
--- a/airsonic-main/src/main/java/org/airsonic/player/security/CustomUserDetailsContextMapper.java
+++ b/airsonic-main/src/main/java/org/airsonic/player/security/CustomUserDetailsContextMapper.java
@@ -110,7 +110,7 @@ public class CustomUserDetailsContextMapper implements UserDetailsContextMapper
 
     public void mapUserToContext(UserDetails user, DirContextAdapter ctx) {
         throw new UnsupportedOperationException(
-                "LdapUserDetailsMapper only supports reading from a context. Please"
+                "LdapUserDetailsMapper only supports reading from a context. Please "
                         + "use a subclass if mapUserToContext() is required.");
     }
 
diff --git a/airsonic-main/src/main/java/org/airsonic/player/service/upnp/AlbumUpnpProcessor.java b/airsonic-main/src/main/java/org/airsonic/player/service/upnp/AlbumUpnpProcessor.java
index 9b28a437..5ffe9737 100644
--- a/airsonic-main/src/main/java/org/airsonic/player/service/upnp/AlbumUpnpProcessor.java
+++ b/airsonic-main/src/main/java/org/airsonic/player/service/upnp/AlbumUpnpProcessor.java
@@ -38,6 +38,7 @@ import org.springframework.web.util.UriComponentsBuilder;
 
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -120,6 +121,8 @@ public class AlbumUpnpProcessor extends UpnpContentProcessor <Album, MediaFile>
                 albumList =  ap.getChildren(ap.getItemById(album.getComment().replaceAll(ALL_BY_ARTIST + "_", "")));
             } else if (album.getComment().equalsIgnoreCase(ALL_RECENT)) {
                 albumList = getDispatcher().getRecentAlbumProcessor().getAllItems();
+            } else {
+                albumList = new ArrayList<>();
             }
             for (Album a: albumList) {
                 if (a.getId() != -1) {
diff --git a/airsonic-main/src/main/java/org/airsonic/player/util/HttpRange.java b/airsonic-main/src/main/java/org/airsonic/player/util/HttpRange.java
index 5aae4456..29ca2c4b 100644
--- a/airsonic-main/src/main/java/org/airsonic/player/util/HttpRange.java
+++ b/airsonic-main/src/main/java/org/airsonic/player/util/HttpRange.java
@@ -56,7 +56,7 @@ public class HttpRange {
             String firstString = matcher.group(1);
             String lastString = StringUtils.trimToNull(matcher.group(2));
 
-            Long first = Long.parseLong(firstString);
+            long first = Long.parseLong(firstString);
             Long last = lastString == null ? null : Long.parseLong(lastString);
 
             if (last != null && first > last) {