diff --git a/vm/stack.go b/vm/stack.go
index b9eaa10cd4..f20470db36 100644
--- a/vm/stack.go
+++ b/vm/stack.go
@@ -152,6 +152,10 @@ func (m *Memory) Get(offset, size int64) []byte {
 }
 
 func (self *Memory) Geti(offset, size int64) (cpy []byte) {
+	if size == 0 {
+		return nil
+	}
+
 	if len(self.store) > int(offset) {
 		cpy = make([]byte, size)
 		copy(cpy, self.store[offset:offset+size])
diff --git a/vm/vm_debug.go b/vm/vm_debug.go
index 92e4154e4f..656487c9b9 100644
--- a/vm/vm_debug.go
+++ b/vm/vm_debug.go
@@ -34,7 +34,7 @@ func NewDebugVm(env Environment) *DebugVm {
 		lt = LogTyDiff
 	}
 
-	return &DebugVm{env: env, logTy: lt, Recoverable: true}
+	return &DebugVm{env: env, logTy: lt, Recoverable: false}
 }
 
 func (self *DebugVm) Run(me, caller ContextRef, code []byte, value, gas, price *big.Int, callData []byte) (ret []byte, err error) {