diff --git a/app/src/main/java/com/casic/detector/view/MainActivity.kt b/app/src/main/java/com/casic/detector/view/MainActivity.kt
index 79e7e11..0487909 100644
--- a/app/src/main/java/com/casic/detector/view/MainActivity.kt
+++ b/app/src/main/java/com/casic/detector/view/MainActivity.kt
@@ -124,11 +124,11 @@
     private var longitude: Double = 0.0
     private var isFreeTask = false
     private var ids = ArrayList<String>()
+    private var signalTask: TimerTask? = null
+    private var searchMarkerTimer: Timer? = null
     private lateinit var aMap: AMap
     private lateinit var taskBean: TaskBean
     private lateinit var taskId: String
-    private lateinit var searchMarkerTimer: Timer
-    private lateinit var signalTask: TimerTask
 
     /***inner class 需要用到*****start*/
     private val taskViewModel by lazy { ViewModelProvider(this)[TaskViewModel::class.java] }
@@ -405,7 +405,9 @@
                         }
                     }
                     searchMarkerTimer = Timer()
-                    searchMarkerTimer.schedule(signalTask, 0, 100)
+                    searchMarkerTimer?.apply {
+                        schedule(signalTask, 0, 100)
+                    }
 
                     binding.stopFreeTaskButton.visibility = View.VISIBLE
                 }
@@ -820,8 +822,8 @@
     override fun onDestroy() {
         super.onDestroy()
         binding.mapView.onDestroy()
-        signalTask.cancel()
-        searchMarkerTimer.cancel()
+        signalTask?.cancel()
+        searchMarkerTimer?.cancel()
         soundPool.release()
         locationHub.stopLocation()
         //降低串口电位