diff --git a/server/src/main/java/com/genymobile/scrcpy/wrappers/DisplayManager.java b/server/src/main/java/com/genymobile/scrcpy/wrappers/DisplayManager.java
index 3f8ed2bd..2f86bbd2 100644
--- a/server/src/main/java/com/genymobile/scrcpy/wrappers/DisplayManager.java
+++ b/server/src/main/java/com/genymobile/scrcpy/wrappers/DisplayManager.java
@@ -115,7 +115,8 @@ public final class DisplayManager {
         return flags;
     }
 
-    private Method getGetDisplayInfoMethod() throws NoSuchMethodException {
+    // getDisplayInfo() may be used from both the Controller thread and the video (main) thread
+    private synchronized Method getGetDisplayInfoMethod() throws NoSuchMethodException {
         if (getDisplayInfoMethod == null) {
             getDisplayInfoMethod = manager.getClass().getMethod("getDisplayInfo", int.class);
         }
diff --git a/server/src/main/java/com/genymobile/scrcpy/wrappers/ServiceManager.java b/server/src/main/java/com/genymobile/scrcpy/wrappers/ServiceManager.java
index a8a56dab..b1123b55 100644
--- a/server/src/main/java/com/genymobile/scrcpy/wrappers/ServiceManager.java
+++ b/server/src/main/java/com/genymobile/scrcpy/wrappers/ServiceManager.java
@@ -54,7 +54,8 @@ public final class ServiceManager {
         return windowManager;
     }
 
-    public static DisplayManager getDisplayManager() {
+    // The DisplayManager may be used from both the Controller thread and the video (main) thread
+    public static synchronized DisplayManager getDisplayManager() {
         if (displayManager == null) {
             displayManager = DisplayManager.create();
         }