diff --git a/app/src/main/java/io/legado/app/ui/sourcedebug/SourceDebugActivity.kt b/app/src/main/java/io/legado/app/ui/sourcedebug/SourceDebugActivity.kt
index 4601eb202..0d0a9f014 100644
--- a/app/src/main/java/io/legado/app/ui/sourcedebug/SourceDebugActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/sourcedebug/SourceDebugActivity.kt
@@ -88,10 +88,12 @@ class SourceDebugActivity : BaseActivity<AndroidViewModel>(), SourceDebug.Callba
 
     override fun printLog(state: Int, msg: String) {
         launch {
-            adapter.logList.add(msg)
-            adapter.notifyItemChanged(adapter.logList.size - 1)
-            if (state == -1 || state == 1000) {
-                rotate_loading.visibility = View.GONE
+            synchronized(this) {
+                adapter.logList.add(msg)
+                adapter.notifyItemChanged(adapter.logList.size - 1)
+                if (state == -1 || state == 1000) {
+                    rotate_loading.visibility = View.GONE
+                }
             }
         }
     }