Fix cli errors when using ctrl+c to stop

Author: TBlueF

implementations/cli/src/main/java/de/bluecolored/bluemap/cli/BlueMapCLI.java

@@ -68,9 +68,12 @@
 
 public class BlueMapCLI {
 
+    private static boolean shutdownInProgress = false;
+
     private String minecraftVersion = null;
     private Path configFolder = Path.of("config");
 
+
     public void renderMaps(BlueMapService blueMap, boolean watch, Predicate<TileState> force, boolean forceGenerateWebapp,
                            @Nullable String mapsToRender) throws ConfigurationException, IOException, InterruptedException {
 
@@ -190,7 +193,10 @@ public void run() {
             Logger.global.logInfo("Stopped.");
         };
 
-        Thread shutdownHook = new Thread(shutdown, "BlueMap-CLI-ShutdownHook");
+        Thread shutdownHook = new Thread(() -> {
+            shutdownInProgress = true;
+            shutdown.run();
+        }, "BlueMap-CLI-ShutdownHook");
         Runtime.getRuntime().addShutdownHook(shutdownHook);
 
         //metrics report
@@ -201,6 +207,8 @@ public void run() {
 
         // wait until done, then shutdown if not watching
         renderManager.awaitIdle();
+        if (shutdownInProgress) return;
+
         Logger.global.logInfo("Your maps are now all up-to-date!");
 
         if (watch) {