diff --git a/src/main/java/net/runelite/deob/deobfuscators/arithmetic/MultiplicationDeobfuscator.java b/src/main/java/net/runelite/deob/deobfuscators/arithmetic/MultiplicationDeobfuscator.java
index e3dc8fe725..2e1f603503 100644
--- a/src/main/java/net/runelite/deob/deobfuscators/arithmetic/MultiplicationDeobfuscator.java
+++ b/src/main/java/net/runelite/deob/deobfuscators/arithmetic/MultiplicationDeobfuscator.java
@@ -14,6 +14,7 @@ import net.runelite.deob.attributes.code.instruction.types.PushConstantInstructi
 import net.runelite.deob.attributes.code.instructions.BiPush;
 import net.runelite.deob.attributes.code.instructions.IAdd;
 import net.runelite.deob.attributes.code.instructions.IConst_M1;
+import net.runelite.deob.attributes.code.instructions.IInc;
 import net.runelite.deob.attributes.code.instructions.IMul;
 import net.runelite.deob.attributes.code.instructions.ISub;
 import net.runelite.deob.attributes.code.instructions.LAdd;
@@ -75,6 +76,9 @@ public class MultiplicationDeobfuscator implements Deobfuscator
 						
 						LVTInstruction storelvt = (LVTInstruction) storeCtx.getInstruction();
 
+						if (storelvt instanceof IInc)
+							throw new IllegalStateException();
+
 						assert storelvt.store();
 
 						InstructionContext pushed = storeCtx.getPops().get(0).getPushed();