--- a/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/meta/HotSpotRuntime.java	Fri Jul 12 23:26:01 2013 +0200
+++ b/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/meta/HotSpotRuntime.java	Mon Jul 15 10:48:10 2013 +0200
@@ -1168,7 +1168,11 @@
                 return Constant.forInt(base == null ? unsafe.getInt(displacement) : unsafe.getInt(base, displacement));
             case Long:
                 if (displacement == config().hubOffset && this.getGraalRuntime().getRuntime().config.useCompressedKlassPointers) {
-                    return Constant.forLong(this.getGraalRuntime().getCompilerToVM().readUnsafeKlassPointer(base));
+                    if (base == null) {
+                        throw new GraalInternalError("Base of object must not be null");
+                    } else {
+                        return Constant.forLong(this.getGraalRuntime().getCompilerToVM().readUnsafeKlassPointer(base));
+                    }
                 } else {
                     return Constant.forLong(base == null ? unsafe.getLong(displacement) : unsafe.getLong(base, displacement));
                 }