diff --git a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/SWFInputStream.java b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/SWFInputStream.java
index fb4172f04..8fc43f598 100644
--- a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/SWFInputStream.java
+++ b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/SWFInputStream.java
@@ -1478,10 +1478,10 @@ public class SWFInputStream implements AutoCloseable {
                                 ret = new DefineExternalImage2(sis, data);
                                 break;
                             default:
-                                ret = new UnknownTag(swf, tag.getId(), data);
+                                ret = new UnknownTag(sis, tag.getId(), data);
                         }
                     } else {
-                        ret = new UnknownTag(swf, tag.getId(), data);
+                        ret = new UnknownTag(sis, tag.getId(), data);
                     }
             }
 
diff --git a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/UnknownTag.java b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/UnknownTag.java
index 6e4bf255c..943f8af44 100644
--- a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/UnknownTag.java
+++ b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/UnknownTag.java
@@ -16,7 +16,6 @@
  */
 package com.jpexs.decompiler.flash.tags;
 
-import com.jpexs.decompiler.flash.SWF;
 import com.jpexs.decompiler.flash.SWFInputStream;
 import com.jpexs.decompiler.flash.SWFOutputStream;
 import com.jpexs.helpers.ByteArrayRange;
@@ -28,12 +27,14 @@ import java.io.IOException;
  */
 public class UnknownTag extends Tag {
 
-    public UnknownTag(SWF swf, int id, ByteArrayRange data) {
-        super(swf, id, "Unknown", data);
+    public UnknownTag(SWFInputStream sis, int id, ByteArrayRange data) throws IOException {
+        super(sis.getSwf(), id, "Unknown", data);
+        readData(sis, data, 0, false, false, false);
     }
 
     @Override
     public final void readData(SWFInputStream sis, ByteArrayRange data, int level, boolean parallel, boolean skipUnusualTags, boolean lazy) throws IOException {
+        sis.skipBytes(sis.available());
     }
 
     /**