diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4d251dac..0fdc3848 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,10 @@
 ## Unreleased
 
 - Fix master branch AppVeyor badge link URL in README.MD - See [Issue #140](https://github.com/PowerShell/xComputerManagement/issues/140).
+- Fix deletion of scheduled task with unknown or empty task trigger.
+  Get-TargetResource returns an empty ScheduleType string if the task
+  trigger is empty or unknown - See [Issue
+  #137](https://github.com/PowerShell/xComputerManagement/issues/137).
 
 ## 4.0.0.0
 
diff --git a/Modules/xComputerManagement/DSCResources/MSFT_xScheduledTask/MSFT_xScheduledTask.psm1 b/Modules/xComputerManagement/DSCResources/MSFT_xScheduledTask/MSFT_xScheduledTask.psm1
index c731e18a..717b7487 100644
--- a/Modules/xComputerManagement/DSCResources/MSFT_xScheduledTask/MSFT_xScheduledTask.psm1
+++ b/Modules/xComputerManagement/DSCResources/MSFT_xScheduledTask/MSFT_xScheduledTask.psm1
@@ -438,9 +438,8 @@ function Get-TargetResource
 
             default
             {
-                New-InvalidArgumentException `
-                    -Message ($script:localizedData.TriggerTypeError -f $trigger.CimClass.CimClassName) `
-                    -ArgumentName CimClassName
+                $returnScheduleType = ''
+                Write-Verbose -Message ($script:localizedData.TriggerTypeUnknown -f $trigger.CimClass.CimClassName)
             }
         }
 
diff --git a/Modules/xComputerManagement/DSCResources/MSFT_xScheduledTask/en-US/MSFT_xScheduledTask.strings.psd1 b/Modules/xComputerManagement/DSCResources/MSFT_xScheduledTask/en-US/MSFT_xScheduledTask.strings.psd1
index f80f00ed..6858ab69 100644
--- a/Modules/xComputerManagement/DSCResources/MSFT_xScheduledTask/en-US/MSFT_xScheduledTask.strings.psd1
+++ b/Modules/xComputerManagement/DSCResources/MSFT_xScheduledTask/en-US/MSFT_xScheduledTask.strings.psd1
@@ -2,7 +2,7 @@ ConvertFrom-StringData @'
     GetScheduledTaskMessage = Getting scheduled task '{0}' in '{1}'.
     TaskNotFoundMessage = Task '{0}' not found in '{1}'. Returning an empty task with Ensure = "Absent".
     TaskFoundMessage = Task '{0}' found in '{1}'. Retrieving settings, first action, first trigger and repetition settings.
-    TriggerTypeError = Trigger type '{0}' not recognized.
+    TriggerTypeUnknown = Trigger type '{0}' not recognized.
     DetectedScheduleTypeMessage = Detected schedule type '{0}' for first trigger.
     SetScheduledTaskMessage = Setting scheduled task '{0}' in '{1}'.
     DisablingExistingScheduledTask = Disabling existing scheduled task '{0}' in '{1}'.
diff --git a/Tests/Unit/MSFT_xScheduledTask.Tests.ps1 b/Tests/Unit/MSFT_xScheduledTask.Tests.ps1
index 5c24831e..2950a9ba 100644
--- a/Tests/Unit/MSFT_xScheduledTask.Tests.ps1
+++ b/Tests/Unit/MSFT_xScheduledTask.Tests.ps1
@@ -1494,6 +1494,52 @@ try
                     Test-TargetResource @testParameters | Should -Be $true
                 }
             }
+
+            Context 'When a built-in scheduled task exists and is enabled, but it should be disabled and the trigger type is not recognized' {
+                $testParameters = @{
+                    TaskName = 'Test task'
+                    TaskPath = '\Test\'
+                    Enable   = $false
+                    Verbose  = $True
+                }
+
+                Mock -CommandName Get-ScheduledTask -MockWith {
+                    @{
+                        TaskName = $testParameters.TaskName
+                        TaskPath = $testParameters.TaskPath
+                        Actions  = [pscustomobject] @{
+                            Execute = 'C:\windows\system32\WindowsPowerShell\v1.0\powershell.exe'
+                        }
+                        Triggers = [pscustomobject] @{
+                            Repetition = @{
+                                Duration = "PT15M"
+                                Interval = "PT15M"
+                            }
+                            CimClass   = @{
+                                CimClassName = 'MSFT_TaskEventTrigger'
+                            }
+                        }
+                        Settings = [pscustomobject] @{
+                            Enabled = $true
+                        }
+                    } }
+
+                It 'Should return the correct values from Get-TargetResource' {
+                    $result = Get-TargetResource @testParameters
+                    $result.Enable | Should -Be $true
+                    $result.Ensure | Should -Be 'Present'
+                    $result.ScheduleType | Should -BeNullOrEmpty
+                }
+
+                It 'Should return false from the test method' {
+                    Test-TargetResource @testParameters | Should -Be $false
+                }
+
+                It 'Should disable the scheduled task in the set method' {
+                    Set-TargetResource @testParameters
+                    Assert-MockCalled Register-ScheduledTask -Exactly -Times 1
+                }
+            }
         }
     }
     #endregion