diff --git a/modules/permission-management/src/Volo.Abp.PermissionManagement.Domain/Volo/Abp/PermissionManagement/PermissionManager.cs b/modules/permission-management/src/Volo.Abp.PermissionManagement.Domain/Volo/Abp/PermissionManagement/PermissionManager.cs
index 0e36316c5b..b664e5c92d 100644
--- a/modules/permission-management/src/Volo.Abp.PermissionManagement.Domain/Volo/Abp/PermissionManagement/PermissionManager.cs
+++ b/modules/permission-management/src/Volo.Abp.PermissionManagement.Domain/Volo/Abp/PermissionManagement/PermissionManager.cs
@@ -62,27 +62,57 @@ public class PermissionManager : IPermissionManager, ISingletonDependency
 
     public virtual async Task<PermissionWithGrantedProviders> GetAsync(string permissionName, string providerName, string providerKey)
     {
+        var permission = await PermissionDefinitionManager.GetOrNullAsync(permissionName);
+        if (permission == null)
+        {
+            return new PermissionWithGrantedProviders(permissionName, false);
+        }
+        
         return await GetInternalAsync(
-            await PermissionDefinitionManager.GetAsync(permissionName),
+            permission,
             providerName,
             providerKey
         );
     }
 
-    public virtual async Task<MultiplePermissionWithGrantedProviders> GetAsync(string[] permissionNames, string providerName, string providerKey)
+    public virtual async Task<MultiplePermissionWithGrantedProviders> GetAsync(
+        string[] permissionNames, 
+        string providerName,
+        string providerKey)
     {
-        var permissionDefinitions = new PermissionDefinition[permissionNames.Length];
+        var permissions = new List<PermissionDefinition>();
+        var undefinedPermissions = new List<string>();
+
+        foreach (var permissionName in permissionNames)
+        {
+            var permission = await PermissionDefinitionManager.GetOrNullAsync(permissionName);
+            if (permission != null)
+            {
+                permissions.Add(permission);
+            }
+            else
+            {
+                undefinedPermissions.Add(permissionName);
+            }
+        }
 
-        for (var i = 0; i < permissionNames.Length; i++)
+        if (!permissions.Any())
         {
-            permissionDefinitions[i] = await PermissionDefinitionManager.GetAsync(permissionNames[i]);
+            return new MultiplePermissionWithGrantedProviders(undefinedPermissions.ToArray());
         }
 
-        return await GetInternalAsync(
-            permissionDefinitions,
+        var result = await GetInternalAsync(
+            permissions.ToArray(),
             providerName,
             providerKey
         );
+
+        foreach (var undefinedPermission in undefinedPermissions)
+        {
+            result.Result.Add(new PermissionWithGrantedProviders(undefinedPermission, false));
+        }
+
+        return result;
     }
 
     public virtual async Task<List<PermissionWithGrantedProviders>> GetAllAsync(string providerName, string providerKey)
@@ -97,7 +127,13 @@ public class PermissionManager : IPermissionManager, ISingletonDependency
 
     public virtual async Task SetAsync(string permissionName, string providerName, string providerKey, bool isGranted)
     {
-        var permission = await PermissionDefinitionManager.GetAsync(permissionName);
+        var permission = await PermissionDefinitionManager.GetOrNullAsync(permissionName);
+        if (permission == null)
+        {
+            /* Silently ignore undefined permissions,
+               maybe they were removed from dynamic permission definition store */
+            return;
+        }
 
         if (!permission.IsEnabled || !await SimpleStateCheckerManager.IsEnabledAsync(permission))
         {
@@ -160,14 +196,24 @@ public class PermissionManager : IPermissionManager, ISingletonDependency
         }
     }
 
-    protected virtual async Task<PermissionWithGrantedProviders> GetInternalAsync(PermissionDefinition permission, string providerName, string providerKey)
+    protected virtual async Task<PermissionWithGrantedProviders> GetInternalAsync(
+        PermissionDefinition permission,
+        string providerName,
+        string providerKey)
     {
-        var multiplePermissionWithGrantedProviders = await GetInternalAsync(new PermissionDefinition[] { permission }, providerName, providerKey);
+        var multiplePermissionWithGrantedProviders = await GetInternalAsync(
+            new[] { permission },
+            providerName,
+            providerKey
+        );
 
         return multiplePermissionWithGrantedProviders.Result.First();
     }
 
-    protected virtual async Task<MultiplePermissionWithGrantedProviders> GetInternalAsync(PermissionDefinition[] permissions, string providerName, string providerKey)
+    protected virtual async Task<MultiplePermissionWithGrantedProviders> GetInternalAsync(
+        PermissionDefinition[] permissions,
+        string providerName,
+        string providerKey)
     {
         var permissionNames = permissions.Select(x => x.Name).ToArray();
         var multiplePermissionWithGrantedProviders = new MultiplePermissionWithGrantedProviders(permissionNames);
diff --git a/modules/permission-management/test/Volo.Abp.PermissionManagement.Domain.Tests/Volo/Abp/PermissionManagement/PermissionChecker_Basic_Tests.cs b/modules/permission-management/test/Volo.Abp.PermissionManagement.Domain.Tests/Volo/Abp/PermissionManagement/PermissionChecker_Basic_Tests.cs
index aa9e7ecca9..78ab5d0af9 100644
--- a/modules/permission-management/test/Volo.Abp.PermissionManagement.Domain.Tests/Volo/Abp/PermissionManagement/PermissionChecker_Basic_Tests.cs
+++ b/modules/permission-management/test/Volo.Abp.PermissionManagement.Domain.Tests/Volo/Abp/PermissionManagement/PermissionChecker_Basic_Tests.cs
@@ -15,11 +15,9 @@ public class PermissionChecker_Basic_Tests : PermissionTestBase
     }
 
     [Fact]
-    public async Task Should_Throw_Exception_If_Permission_Is_Not_Defined()
+    public async Task Should_Return_Prohibited_If_Permission_Is_Not_Defined()
     {
-        await Assert.ThrowsAsync<AbpException>(async () =>
-            await _permissionChecker.IsGrantedAsync("UndefinedPermissionName")
-        );
+        (await _permissionChecker.IsGrantedAsync("UndefinedPermissionName")).ShouldBeFalse();
     }
 
     [Fact]
diff --git a/modules/permission-management/test/Volo.Abp.PermissionManagement.Domain.Tests/Volo/Abp/PermissionManagement/PermissionManager_Tests.cs b/modules/permission-management/test/Volo.Abp.PermissionManagement.Domain.Tests/Volo/Abp/PermissionManagement/PermissionManager_Tests.cs
index 06e245046c..1f771bdb3b 100644
--- a/modules/permission-management/test/Volo.Abp.PermissionManagement.Domain.Tests/Volo/Abp/PermissionManagement/PermissionManager_Tests.cs
+++ b/modules/permission-management/test/Volo.Abp.PermissionManagement.Domain.Tests/Volo/Abp/PermissionManagement/PermissionManager_Tests.cs
@@ -72,12 +72,12 @@ public class PermissionManager_Tests : PermissionTestBase
     }
 
     [Fact]
-    public async Task Get_Should_Exception_When_Permission_Undefined()
+    public async Task Get_Should_Return_Not_Granted_When_Permission_Undefined()
     {
-        await Assert.ThrowsAsync<AbpException>(async () => await _permissionManager.GetAsync(
-            "MyPermission1NotExist",
-            "Test",
-            "Test"));
+        var result = await _permissionManager.GetAsync("MyPermission1NotExist", "Test", "Test");
+        result.Name.ShouldBe("MyPermission1NotExist");
+        result.Providers.ShouldBeEmpty();
+        result.IsGranted.ShouldBeFalse();
     }
 
     [Fact]
@@ -126,13 +126,13 @@ public class PermissionManager_Tests : PermissionTestBase
     }
 
     [Fact]
-    public async Task Set_Should_Exception_When_Permission_Undefined()
+    public async Task Set_Should_Silently_Ignore_When_Permission_Undefined()
     {
-        await Assert.ThrowsAsync<AbpException>(async () => await _permissionManager.SetAsync(
+        await _permissionManager.SetAsync(
             "MyPermission1NotExist",
             "Test",
             "Test",
-            true));
+            true);
     }
 
     [Fact]