diff --git a/src/Umbraco.Web.UI.Client/src/common/services/navigation.service.js b/src/Umbraco.Web.UI.Client/src/common/services/navigation.service.js
index 1c28654a1a..ca89f7824b 100644
--- a/src/Umbraco.Web.UI.Client/src/common/services/navigation.service.js
+++ b/src/Umbraco.Web.UI.Client/src/common/services/navigation.service.js
@@ -225,8 +225,10 @@ function navigationService($routeParams, $location, $q, $injector, eventsService
         retainQueryStrings: function (currRouteParams, nextRouteParams) {
             var toRetain = angular.copy(nextRouteParams);
             var updated = false;
+
             _.each(retainedQueryStrings, function (r) {
-                if (currRouteParams[r] && !nextRouteParams[r]) {
+                // if mculture is set to null in nextRouteParams, the value will be undefined and we will not retain any query string that has a value of "null"
+                if (currRouteParams[r] && nextRouteParams[r] !== undefined && !nextRouteParams[r]) {
                     toRetain[r] = currRouteParams[r];
                     updated = true;
                 }
diff --git a/src/Umbraco.Web.UI.Client/src/navigation.controller.js b/src/Umbraco.Web.UI.Client/src/navigation.controller.js
index e4c94f3c66..b585d22e9f 100644
--- a/src/Umbraco.Web.UI.Client/src/navigation.controller.js
+++ b/src/Umbraco.Web.UI.Client/src/navigation.controller.js
@@ -212,6 +212,22 @@ function NavigationController($scope, $rootScope, $location, $log, $q, $routePar
     evts.push(eventsService.on("editors.languages.languageDeleted", function (e, args) {
         loadLanguages().then(function (languages) {
             $scope.languages = languages;
+            const defaultCulture = $scope.languages[0].culture;
+
+            if (args.language.culture === $scope.selectedLanguage.culture) {
+                $scope.selectedLanguage = defaultCulture;
+
+                if ($scope.languages.length > 1) {
+                    $location.search("mculture", defaultCulture);
+                } else {
+                    $location.search("mculture", null);
+                }
+                
+                var currentEditorState = editorState.getCurrent();
+                if (currentEditorState && currentEditorState.path) {
+                    $scope.treeApi.syncTree({ path: currentEditorState.path, activate: true });
+                }
+            }
         });
     }));
 
@@ -255,7 +271,7 @@ function NavigationController($scope, $rootScope, $location, $log, $q, $routePar
     evts.push(eventsService.on("treeService.removeNode", function (e, args) {
         //check to see if the current page has been removed
 
-        var currentEditorState = editorState.getCurrent()
+        var currentEditorState = editorState.getCurrent();
         if (currentEditorState && currentEditorState.id.toString() === args.node.id.toString()) {
             //current page is loaded, so navigate to root
             var section = appState.getSectionState("currentSection");
@@ -279,6 +295,9 @@ function NavigationController($scope, $rootScope, $location, $log, $q, $routePar
             //select the current language if set in the query string
             if (mainCulture && $scope.languages && $scope.languages.length > 1) {
                 var found = _.find($scope.languages, function (l) {
+                    if (mainCulture === true) {
+                        return false;
+                    }
                     return l.culture.toLowerCase() === mainCulture.toLowerCase();
                 });
                 if (found) {
@@ -348,7 +367,7 @@ function NavigationController($scope, $rootScope, $location, $log, $q, $routePar
 
         return contentResource.allowsCultureVariation().then(function (b) {
             if (b === true) {
-                return languageResource.getAll()
+                return languageResource.getAll();
             } else {
                 return $q.when([]); //resolve an empty collection
             }
diff --git a/src/Umbraco.Web.UI.Client/src/views/languages/overview.controller.js b/src/Umbraco.Web.UI.Client/src/views/languages/overview.controller.js
index d1b984ed5b..90d418cf77 100644
--- a/src/Umbraco.Web.UI.Client/src/views/languages/overview.controller.js
+++ b/src/Umbraco.Web.UI.Client/src/views/languages/overview.controller.js
@@ -85,7 +85,7 @@
                 overlayService.open(dialog);
             });
 
-            event.preventDefault()
+            event.preventDefault();
             event.stopPropagation();
         }
 
diff --git a/src/Umbraco.Web.UI/Umbraco/js/navigation.controller.js b/src/Umbraco.Web.UI/Umbraco/js/navigation.controller.js
index e4c94f3c66..b585d22e9f 100644
--- a/src/Umbraco.Web.UI/Umbraco/js/navigation.controller.js
+++ b/src/Umbraco.Web.UI/Umbraco/js/navigation.controller.js
@@ -212,6 +212,22 @@ function NavigationController($scope, $rootScope, $location, $log, $q, $routePar
     evts.push(eventsService.on("editors.languages.languageDeleted", function (e, args) {
         loadLanguages().then(function (languages) {
             $scope.languages = languages;
+            const defaultCulture = $scope.languages[0].culture;
+
+            if (args.language.culture === $scope.selectedLanguage.culture) {
+                $scope.selectedLanguage = defaultCulture;
+
+                if ($scope.languages.length > 1) {
+                    $location.search("mculture", defaultCulture);
+                } else {
+                    $location.search("mculture", null);
+                }
+                
+                var currentEditorState = editorState.getCurrent();
+                if (currentEditorState && currentEditorState.path) {
+                    $scope.treeApi.syncTree({ path: currentEditorState.path, activate: true });
+                }
+            }
         });
     }));
 
@@ -255,7 +271,7 @@ function NavigationController($scope, $rootScope, $location, $log, $q, $routePar
     evts.push(eventsService.on("treeService.removeNode", function (e, args) {
         //check to see if the current page has been removed
 
-        var currentEditorState = editorState.getCurrent()
+        var currentEditorState = editorState.getCurrent();
         if (currentEditorState && currentEditorState.id.toString() === args.node.id.toString()) {
             //current page is loaded, so navigate to root
             var section = appState.getSectionState("currentSection");
@@ -279,6 +295,9 @@ function NavigationController($scope, $rootScope, $location, $log, $q, $routePar
             //select the current language if set in the query string
             if (mainCulture && $scope.languages && $scope.languages.length > 1) {
                 var found = _.find($scope.languages, function (l) {
+                    if (mainCulture === true) {
+                        return false;
+                    }
                     return l.culture.toLowerCase() === mainCulture.toLowerCase();
                 });
                 if (found) {
@@ -348,7 +367,7 @@ function NavigationController($scope, $rootScope, $location, $log, $q, $routePar
 
         return contentResource.allowsCultureVariation().then(function (b) {
             if (b === true) {
-                return languageResource.getAll()
+                return languageResource.getAll();
             } else {
                 return $q.when([]); //resolve an empty collection
             }
diff --git a/src/Umbraco.Web/Cache/LanguageCacheRefresher.cs b/src/Umbraco.Web/Cache/LanguageCacheRefresher.cs
index 8463acd6e0..b1fc0a9e55 100644
--- a/src/Umbraco.Web/Cache/LanguageCacheRefresher.cs
+++ b/src/Umbraco.Web/Cache/LanguageCacheRefresher.cs
@@ -46,7 +46,7 @@ namespace Umbraco.Web.Cache
             ClearAllIsolatedCacheByEntityType<ILanguage>();
 
             foreach (var payload in payloads)
-            {   
+            {
                 switch (payload.ChangeType)
                 {
                     case LanguageChangeType.Update:
@@ -73,7 +73,7 @@ namespace Umbraco.Web.Cache
                 ContentCacheRefresher.RefreshContentTypes(AppCaches); // we need to evict all IContent items
                 //now refresh all nucache
                 var clearContentPayload = new[] { new ContentCacheRefresher.JsonPayload(0, null, TreeChangeTypes.RefreshAll) };
-                ContentCacheRefresher.NotifyPublishedSnapshotService(_publishedSnapshotService, AppCaches, clearContentPayload);                
+                ContentCacheRefresher.NotifyPublishedSnapshotService(_publishedSnapshotService, AppCaches, clearContentPayload);
             }
 
             // then trigger event