diff --git a/src/main/java/com/replaymod/editor/gui/MarkerProcessor.java b/src/main/java/com/replaymod/editor/gui/MarkerProcessor.java
index 9224d4e5..12efe758 100644
--- a/src/main/java/com/replaymod/editor/gui/MarkerProcessor.java
+++ b/src/main/java/com/replaymod/editor/gui/MarkerProcessor.java
@@ -144,7 +144,11 @@ public class MarkerProcessor {
                                 duration = nextPacket.getTime() - timeOffset;
                             }
                             nextPacket = replayInputStream.readPacket();
-                            progress.accept((float) nextPacket.getTime() / (float) inputDuration);
+                            if (nextPacket != null) {
+                                progress.accept((float) nextPacket.getTime() / (float) inputDuration);
+                            } else {
+                                progress.accept(1f);
+                            }
                         }
                     }