diff --git a/Sources/General/SessionManager.swift b/Sources/General/SessionManager.swift
index afc7859..546b753 100644
--- a/Sources/General/SessionManager.swift
+++ b/Sources/General/SessionManager.swift
@@ -440,6 +440,10 @@ extension SessionManager {
     
     public func start(_ task: DownloadTask, onMainQueue: Bool = true, handler: Handler<DownloadTask>? = nil) {
         operationQueue.async {
+            guard let _ = self.fetchTask(task.url) else {
+                self.log(.error("can't start downloadTask", error: TiercelError.fetchDownloadTaskFailed(url: task.url)))
+                return
+            }
             self._start(task, onMainQueue: onMainQueue, handler: handler)
         }
     }
@@ -479,6 +483,10 @@ extension SessionManager {
     
     public func suspend(_ task: DownloadTask, onMainQueue: Bool = true, handler: Handler<DownloadTask>? = nil) {
         operationQueue.async {
+            guard let _ = self.fetchTask(task.url) else {
+                self.log(.error("can't suspend downloadTask", error: TiercelError.fetchDownloadTaskFailed(url: task.url)))
+                return
+            }
             task.suspend(onMainQueue: onMainQueue, handler: handler)
         }
     }
@@ -500,6 +508,10 @@ extension SessionManager {
     
     public func cancel(_ task: DownloadTask, onMainQueue: Bool = true, handler: Handler<DownloadTask>? = nil) {
         operationQueue.async {
+            guard let _ = self.fetchTask(task.url) else {
+                self.log(.error("can't cancel downloadTask", error: TiercelError.fetchDownloadTaskFailed(url: task.url)))
+                return
+            }
             task.cancel(onMainQueue: onMainQueue, handler: handler)
         }
     }
@@ -526,6 +538,10 @@ extension SessionManager {
     
     public func remove(_ task: DownloadTask, completely: Bool = false, onMainQueue: Bool = true, handler: Handler<DownloadTask>? = nil) {
         operationQueue.async {
+            guard let _ = self.fetchTask(task.url) else {
+                self.log(.error("can't remove downloadTask", error: TiercelError.fetchDownloadTaskFailed(url: task.url)))
+                return
+            }
             task.remove(completely: completely, onMainQueue: onMainQueue, handler: handler)
         }
     }
diff --git a/Tiercel.xcodeproj/project.pbxproj b/Tiercel.xcodeproj/project.pbxproj
index 571f2d4..9c20c34 100644
--- a/Tiercel.xcodeproj/project.pbxproj
+++ b/Tiercel.xcodeproj/project.pbxproj
@@ -559,7 +559,7 @@
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
-				MARKETING_VERSION = 3.2.1;
+				MARKETING_VERSION = 3.2.2;
 				PRODUCT_BUNDLE_IDENTIFIER = com.Daniels.Tiercel;
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
@@ -589,7 +589,7 @@
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
-				MARKETING_VERSION = 3.2.1;
+				MARKETING_VERSION = 3.2.2;
 				PRODUCT_BUNDLE_IDENTIFIER = com.Daniels.Tiercel;
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				PROVISIONING_PROFILE_SPECIFIER = "";