Added null pointer check.

yuhuashangedward · Jul 7, 2018 · 20eaccd · 20eaccd
1 parent d6ec109
commit 20eaccd
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/ethereumj-core/src/main/java/org/ethereum/vm/VM.java b/ethereumj-core/src/main/java/org/ethereum/vm/VM.java
@@ -104,7 +104,10 @@ public VM(SystemProperties config) {
         this.config = config;
         vmTrace = config.vmTrace();
         dumpBlock = config.dumpBlock();
-        vmHook = vmHookFactory.build();
+
+        if (vmHookFactory != null) {
+            vmHook = vmHookFactory.build();
+        }
     }
 
     private long calcMemGas(GasCost gasCosts, long oldMemSize, BigInteger newMemSize, long copySize) {