diff --git a/deob/src/main/java/dev/openrs2/deob/analysis/LiveVariableAnalyzer.kt b/deob/src/main/java/dev/openrs2/deob/analysis/LiveVariableAnalyzer.kt
index 1c8c6dd55f..77457c21e1 100644
--- a/deob/src/main/java/dev/openrs2/deob/analysis/LiveVariableAnalyzer.kt
+++ b/deob/src/main/java/dev/openrs2/deob/analysis/LiveVariableAnalyzer.kt
@@ -47,6 +47,8 @@ public class LiveVariableAnalyzer(owner: String, method: MethodNode) :
     private fun IntSet.plus(element: Int): IntSet {
         if (contains(element)) {
             return this
+        } else if (isEmpty()) {
+            return IntSets.singleton(element)
         }
 
         val newSet = IntOpenHashSet(this)