diff --git a/jasm-composition-jvm/src/main/java/me/darknet/assembler/compile/analysis/jvm/AnalysisSimulation.java b/jasm-composition-jvm/src/main/java/me/darknet/assembler/compile/analysis/jvm/AnalysisSimulation.java
index a45ef57..3ab569c 100644
--- a/jasm-composition-jvm/src/main/java/me/darknet/assembler/compile/analysis/jvm/AnalysisSimulation.java
+++ b/jasm-composition-jvm/src/main/java/me/darknet/assembler/compile/analysis/jvm/AnalysisSimulation.java
@@ -100,6 +100,8 @@ public void execute(JvmAnalysisEngine<Frame> engine, AnalysisSimulation.Info met
             while (index < elementCount) {
                 Frame oldFrame = frame.copy();
                 frame = frame.copy();
+                if (index < 0)
+                    throw new AnalysisException("Analysis jumped to invalid range: " + index);
                 CodeElement element = elements.get(index);
 
                 Frame existingFrame = engine.getFrame(index);