diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6ea286f7bc..b9f836e5f3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
+### Fixed
+- [#2424] DefineEditText handling of letterSpacing, font size on incorrect values
 
 ## [22.0.2] - 2025-01-17
 ### Added
@@ -3688,6 +3690,7 @@ Major version of SWF to XML export changed to 2.
 [alpha 9]: https://github.com/jindrapetrik/jpexs-decompiler/compare/alpha8...alpha9
 [alpha 8]: https://github.com/jindrapetrik/jpexs-decompiler/compare/alpha7...alpha8
 [alpha 7]: https://github.com/jindrapetrik/jpexs-decompiler/releases/tag/alpha7
+[#2424]: https://www.free-decompiler.com/flash/issues/2424
 [#2375]: https://www.free-decompiler.com/flash/issues/2375
 [#2374]: https://www.free-decompiler.com/flash/issues/2374
 [#2389]: https://www.free-decompiler.com/flash/issues/2389
diff --git a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/DefineEditTextTag.java b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/DefineEditTextTag.java
index 373fa65149..4454c2145d 100644
--- a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/DefineEditTextTag.java
+++ b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/DefineEditTextTag.java
@@ -450,20 +450,24 @@ public void startElement(String uri, String localName, String qName, Attributes
                                     }
                                 }
                                 String size = unescape(attributes.getValue("size"));
-                                if (size != null && size.length() > 0) {
-                                    char firstChar = size.charAt(0);
-                                    if (firstChar != '+' && firstChar != '-') {
-                                        int fontSize = Integer.parseInt(size);
-                                        style.fontHeight = (int) Math.round(fontSize * SWF.unitDivisor);
-                                    } else {
-                                        int fontSizeDelta = (int) Math.round(Integer.parseInt(size.substring(1)) * SWF.unitDivisor);
-                                        if (firstChar == '+') {
-                                            style.fontHeight = style.fontHeight + fontSizeDelta;
+                                if (size != null && size.length() > 0) {                                    
+                                    try {
+                                        char firstChar = size.charAt(0);
+                                        if (firstChar != '+' && firstChar != '-') {
+                                            int fontSize = Integer.parseInt(size);
+                                            style.fontHeight = (int) Math.round(fontSize * SWF.unitDivisor);
                                         } else {
-                                            style.fontHeight = style.fontHeight - fontSizeDelta;
+                                            int fontSizeDelta = (int) Math.round(Integer.parseInt(size.substring(1)) * SWF.unitDivisor);
+                                            if (firstChar == '+') {
+                                                style.fontHeight = style.fontHeight + fontSizeDelta;
+                                            } else {
+                                                style.fontHeight = style.fontHeight - fontSizeDelta;
+                                            }
                                         }
+                                        style.fontLeading = leading;
+                                    } catch (NumberFormatException nfe) {
+                                        //do not change fontHeight or leading
                                     }
-                                    style.fontLeading = leading;
                                 }
                                 String face = unescape(attributes.getValue("face"));
 
@@ -473,7 +477,11 @@ public void startElement(String uri, String localName, String qName, Attributes
 
                                 String letterspacing = unescape(attributes.getValue("letterSpacing"));
                                 if (letterspacing != null && letterspacing.length() > 0) {
-                                    style.letterSpacing = Double.parseDouble(letterspacing);
+                                    try {
+                                        style.letterSpacing = Double.parseDouble(letterspacing);
+                                    } catch (NumberFormatException nfe) {
+                                        //do not change letterSpacing
+                                    }                                    
                                 }
 
                                 String kerning = unescape(attributes.getValue("kerning"));