diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab5873537..a2603a7b6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ All notable changes to this project will be documented in this file.
 - [#1974] DefineBits image reading problem
 - [#1963] AS2 properly decompile/direct edit long classes
 - [#1977] AS3 Find usages - class and function usages, various fixes
+- IllegalArgumentException: JSplitPane weight must be between 0 and 1
 
 ## [18.3.5] - 2023-02-12
 ### Added
diff --git a/src/com/jpexs/decompiler/flash/gui/PreviewPanel.java b/src/com/jpexs/decompiler/flash/gui/PreviewPanel.java
index 531a2a73b..0bb3f6b04 100644
--- a/src/com/jpexs/decompiler/flash/gui/PreviewPanel.java
+++ b/src/com/jpexs/decompiler/flash/gui/PreviewPanel.java
@@ -1653,7 +1653,7 @@ public class PreviewPanel extends JPersistentSplitPane implements TagEditorPanel
     public void showDisplayEditTagPanel(Tag tag, int frame) {
         showCardLeft(DISPLAYEDIT_TAG_CARD);
         displayEditTag = tag;
-        displayEditSplitPane.setDividerLocation((int) (0.6 * this.getWidth()));
+        displayEditSplitPane.setDividerLocation(0.6);
         displayEditGenericPanel.setVisible(!readOnly);
 
         if (Configuration.editorMode.get()) {