Fixed #1904 NullpointerException when fast switching items

CHANGELOG.md

@@ -8,6 +8,7 @@ All notable changes to this project will be documented in this file.
 
 ### Fixed
 - [#1904] NullpointerException when renaming invalid identifiers in AS1/2 files caused by missing charset
+- [#1904] NullpointerException when fast switching items
 
 ### Changed
 - Warning before switching deobfuscation is now optional

src/com/jpexs/decompiler/flash/gui/ImagePanel.java

@@ -473,7 +473,11 @@ public final class ImagePanel extends JPanel implements MediaDisplay {
         tim.schedule(new TimerTask() {
             @Override
             public void run() {
-                RECT rect = timelined.getRect();
+                Timelined tim = timelined;
+                if (tim == null) {
+                    return;
+                }
+                RECT rect = tim.getRect();
                 double zoomDouble = zoom.fit ? getZoomToFit() : zoom.value;
                 double w = rect.getWidth() / SWF.unitDivisor * zoomDouble;
                 double h = rect.getHeight() / SWF.unitDivisor * zoomDouble;