diff --git a/src/rpc/misc.cpp b/src/rpc/misc.cpp
index c048b305d..0cf02813d 100644
--- a/src/rpc/misc.cpp
+++ b/src/rpc/misc.cpp
@@ -560,7 +560,7 @@ UniValue z_validateaddress(const UniValue& params, bool fHelp, const CPubKey& my
 
 
 #ifdef ENABLE_WALLET
-    LOCK2(cs_main, pwalletMain->cs_wallet);
+    LOCK2(cs_main, pwalletMain ? &pwalletMain->cs_wallet : NULL);
 #else
     LOCK(cs_main);
 #endif