diff --git a/src/org/jetbrains/java/decompiler/code/cfg/ControlFlowGraph.java b/src/org/jetbrains/java/decompiler/code/cfg/ControlFlowGraph.java
index 44c58f0..1365858 100644
--- a/src/org/jetbrains/java/decompiler/code/cfg/ControlFlowGraph.java
+++ b/src/org/jetbrains/java/decompiler/code/cfg/ControlFlowGraph.java
@@ -82,6 +82,7 @@ public class ControlFlowGraph implements CodeConstants {
   }
 
   public String toString() {
+    if (blocks == null) return "Empty";
 
     String new_line_separator = DecompilerContext.getNewLineSeparator();