diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7578a984e..4ba4e09d5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -57,6 +57,7 @@ All notable changes to this project will be documented in this file.
 - AS3 Direct editation - types on instance variable values not properly resolved
 - AS1/2 Debugger - script was cleared on stop button
 - AS1/2 Vanishing source code in some cases
+- AS1/2 Debugger tooltips exception
 
 ### Changed
 - [#2120] Exported assets no longer take names from assigned classes if there is more than 1 assigned class
diff --git a/src/com/jpexs/decompiler/flash/gui/action/ActionPanel.java b/src/com/jpexs/decompiler/flash/gui/action/ActionPanel.java
index 626101d43..efb255978 100644
--- a/src/com/jpexs/decompiler/flash/gui/action/ActionPanel.java
+++ b/src/com/jpexs/decompiler/flash/gui/action/ActionPanel.java
@@ -289,7 +289,7 @@ public class ActionPanel extends JPanel implements SearchListener<ScriptSearchRe
                         lastIns = ins;
                     }
                     if (selIns != null) {
-                        if (selIns instanceof ActionPush) {
+                        if ((selIns instanceof ActionPush) && (inspos > 0)) {
                             ActionPush ap = (ActionPush) selIns;
                             Object var = ap.values.get(inspos - 1);
                             String identifier = null;